# Fresh402 Web Intelligence API

> Web intelligence: free baseline, Check, Extract, Smart Diff and OpenAPI Diff. x402 USDC on Base.

- name: io.github.kirillradchenko96/fresh402
- version: 2.4.0
- connection class: R0 (autonomous)
- trust: 96/100
- quality: 64/100 (needs work)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/io.github.kirillradchenko96%2Ffresh402
- tools: https://api.protogrid.dev/v1/servers/io.github.kirillradchenko96%2Ffresh402/tools

**An agent can connect right now, no human step.** Remote endpoint, no authentication, reachable on the last probe.

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "fresh402": {
      "type": "http",
      "url": "https://fresh402.kirilllabs.workers.dev/mcp"
    }
  }
}
```


## Trust

- hygiene: 100
- liveness: 98
- freshness: 100
- provenance: 90
- drivers: +repository +namespace-matches-repo +website +reachable +uptime-94% +updated-2d-ago
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 64/100 (needs work)

### protocol: 88 (weight 25)

- pass `protocol.modern`: supports 2026-07-28 (server/discover)
- pass `protocol.stateless`: answers without a session
- pass `protocol.transport`: streamable HTTP
- warn `protocol.list_ttl`: tools/list declares ttlMs 0, so clients re-fetch it on every use

### authorization: n/a (weight 15)

- n/a `auth.prm`, `auth.as_metadata`, `auth.cimd`: no remote uses OAuth
- n/a `auth.secret_in_url`: no templated URL

### tool hygiene: 64 (weight 30)

- pass `tools.descriptions`: every tool has a description
- warn `tools.description_length`: 4 tools have descriptions over 1,024 characters, which crowds the context
- pass `tools.schemas`: every tool has an object input schema
- fail `tools.annotations`: no tool declares readOnlyHint or destructiveHint, so clients cannot tell safe calls from risky ones
- fail `tools.directory_hints`: no tool declares all four of readOnlyHint, destructiveHint, idempotentHint and openWorldHint; missing: fresh402_register (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); fresh402_check (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); fresh402_smart_diff (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 5,280 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump

### stability: 25 (weight 15)

- warn `stability.changes`: 16 tool changes in 30 days
- fail `stability.rug_pull`: 7 tools kept their name but changed most of their description in 30 days; review before trusting them

### dependencies: n/a (weight 15)

- n/a `deps.known_vulns`, `deps.mcp_sdk_version`, `deps.resolvable`: no npm or PyPI package

- tools: 5, about 5,280 tokens to load them all
- tool set hash: fe9a50089d5d456ddbfc42b303ecd630
- tools last changed: 2026-10-18T23:27:54.853Z
- badge: [![protogrid quality](https://protogrid.dev/badge/io.github.kirillradchenko96/fresh402.svg)](https://protogrid.dev/servers/io.github.kirillradchenko96/fresh402)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-10-18 `fresh402_openapi_contract_diff` changed (description)
  - before: Detect structural compatibility changes in a public JSON OpenAPI 3.0/3.1 contract: paths, methods, parameters, request requirements and response schemas. Use for API contract review; Smart Diff is for general documents. First register the contract URL with free fresh402_register, without selectors or ignore rules, then reuse watch_id. compare_to accepts previous (default) or baseline; an available same-watch previous_hash overrides it. Limits include 256000 decoded document bytes, 100 paths and 500 operations. No YAML, external reference fetching, API-operation execution, LLM or complete compatibility guarantee. $0.020 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
  - after: Detect structural compatibility changes in a public JSON OpenAPI 3.0/3.1 contract: paths, methods, parameters, request requirements and response schemas. Use for API contract review; Smart Diff is for general documents. First register the contract URL with free fresh402_register, without selectors or ignore rules, then reuse watch_id. compare_to accepts previous (default) or baseline; an available same-watch previous_hash overrides it. Limits include 256000 decoded document bytes, 100 paths and 500 operations. No YAML, external reference fetching, API-operation execution, LLM or complete compatibility guarantee. $0.020 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- 2026-10-18 `fresh402_smart_diff` changed (description)
  - before: Explain structured changes in a registered public document: JSON Pointer changes, HTML block changes and deterministic significance hints. Use instead of Check when a changed/unchanged flag or short text diff is insufficient. First obtain watch_id with free fresh402_register; saved URL/rules are reused. compare_to is previous (default) or baseline; previous_hash overrides it when the same-watch snapshot is retained. Up to 200 changes; legacy HTML may have text-only fidelity. No LLM, JavaScript rendering or complete API compatibility guarantee. $0.015 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
  - after: Explain structured changes in a registered public document: JSON Pointer changes, HTML block changes and deterministic significance hints. Use instead of Check when a changed/unchanged flag or short text diff is insufficient. First obtain watch_id with free fresh402_register; saved URL/rules are reused. compare_to is previous (default) or baseline; previous_hash overrides it when the same-watch snapshot is retained. Up to 200 changes; legacy HTML may have text-only fidelity. No LLM, JavaScript rendering or complete API compatibility guarantee. $0.015 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- 2026-10-18 `fresh402_extract` changed (description)
  - before: Extract readable text, metadata, headings, public links and embedded JSON-LD from one public HTTPS document. Use to read static HTML, JSON or plain text; no watch or prior registration is needed. Optional CSS scope and noise exclusions; max_chars defaults to 20000 and limits returned text, not fetch size. Does not render JavaScript, crawl links or compare versions. $0.010 USDC per call on Base mainnet (eip155:8453), requiring an x402-capable MCP payment client and funded native-USDC payer. An ordinary MCP client receives a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
  - after: Extract readable text, metadata, headings, public links and embedded JSON-LD from one public HTTPS document. Use to read static HTML, JSON or plain text; no watch or prior registration is needed. Optional CSS scope and noise exclusions; max_chars defaults to 20000 and limits returned text, not fetch size. Does not render JavaScript, crawl links or compare versions. $0.010 USDC per call on Base mainnet (eip155:8453), requiring an x402-capable MCP payment client and funded native-USDC payer. An ordinary MCP client receives a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- 2026-10-18 `fresh402_check` changed (description)
  - before: Check whether public HTML, JSON or text changed; use for on-demand freshness checks and a compact deterministic text diff, not background monitoring. Supply exactly one of url or watch_id. A URL-based paid Check can create a watch; an ID reuses its saved URL/rules, so omit all content-rule fields. Reuse returned watch_id/hash for later checks; first URL check without prior state reports changed:null. Optional cache reuse still costs $0.005 USDC per call on Base mainnet (eip155:8453). Requires an x402-capable MCP payment client and funded native-USDC payer; an ordinary MCP client receives a payment challenge, not a paid result. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. No JavaScript execution.
  - after: Check whether public HTML, JSON or text changed; use for on-demand freshness checks and a compact deterministic text diff, not background monitoring. Supply exactly one of url or watch_id. A URL-based paid Check can create a watch; an ID reuses its saved URL/rules, so omit all content-rule fields. Reuse returned watch_id/hash for later checks; first URL check without prior state reports changed:null. Optional cache reuse still costs $0.005 USDC per call on Base mainnet (eip155:8453). Requires an x402-capable MCP payment client and funded native-USDC payer; an ordinary MCP client receives a payment challenge, not a paid result. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. No JavaScript execution. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- 2026-10-18 `fresh402_openapi_contract_diff` changed (description, inputSchema) **meaning changed**
  - before: Compare a registered public JSON OpenAPI 3.0/3.1 contract against its baseline or previous snapshot. Deterministic structural compatibility evidence; no remote references or LLM. $0.020 USDC.
  - after: Detect structural compatibility changes in a public JSON OpenAPI 3.0/3.1 contract: paths, methods, parameters, request requirements and response schemas. Use for API contract review; Smart Diff is for general documents. First register the contract URL with free fresh402_register, without selectors or ignore rules, then reuse watch_id. compare_to accepts previous (default) or baseline; an available same-watch previous_hash overrides it. Limits include 256000 decoded document bytes, 100 paths and 500 operations. No YAML, external reference fetching, API-operation execution, LLM or complete compatibility guarantee. $0.020 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
- 2026-10-18 `fresh402_smart_diff` changed (description, inputSchema) **meaning changed**
  - before: Compare a watch with its previous Smart Diff snapshot or fixed baseline. JSON Pointer changes, HTML block changes and explained significance rules; deterministic, no LLM. $0.015 USDC.
  - after: Explain structured changes in a registered public document: JSON Pointer changes, HTML block changes and deterministic significance hints. Use instead of Check when a changed/unchanged flag or short text diff is insufficient. First obtain watch_id with free fresh402_register; saved URL/rules are reused. compare_to is previous (default) or baseline; previous_hash overrides it when the same-watch snapshot is retained. Up to 200 changes; legacy HTML may have text-only fidelity. No LLM, JavaScript rendering or complete API compatibility guarantee. $0.015 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
- 2026-10-18 `fresh402_extract` changed (description, inputSchema) **meaning changed**
  - before: Extract main text, metadata, headings, links and JSON-LD from a public URL without executing JavaScript. HTML, JSON and text; CSS scoping. $0.01 USDC.
  - after: Extract readable text, metadata, headings, public links and embedded JSON-LD from one public HTTPS document. Use to read static HTML, JSON or plain text; no watch or prior registration is needed. Optional CSS scope and noise exclusions; max_chars defaults to 20000 and limits returned text, not fetch size. Does not render JavaScript, crawl links or compare versions. $0.010 USDC per call on Base mainnet (eip155:8453), requiring an x402-capable MCP payment client and funded native-USDC payer. An ordinary MCP client receives a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery.
- 2026-10-18 `fresh402_check` changed (description, inputSchema) **meaning changed**
  - before: Check a persistent watch or URL for changes, with noise filtering, conditional HTTP and a compact deterministic diff. $0.005 USDC.
  - after: Check whether public HTML, JSON or text changed; use for on-demand freshness checks and a compact deterministic text diff, not background monitoring. Supply exactly one of url or watch_id. A URL-based paid Check can create a watch; an ID reuses its saved URL/rules, so omit all content-rule fields. Reuse returned watch_id/hash for later checks; first URL check without prior state reports changed:null. Optional cache reuse still costs $0.005 USDC per call on Base mainnet (eip155:8453). Requires an x402-capable MCP payment client and funded native-USDC payer; an ordinary MCP client receives a payment challenge, not a paid result. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. Never combine prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. No JavaScript execution.
- 2026-10-18 `fresh402_register` changed (description, inputSchema) **meaning changed**
  - before: Create or retrieve a free persistent baseline. Existing registrations never refetch the target. No JavaScript execution.
  - after: Create or retrieve a free persistent baseline for public HTTPS HTML, JSON or plain text. Use before Smart Diff or OpenAPI Contract Diff, or to obtain a reusable watch_id/hash for Check. Required url plus optional CSS/JSON exclusions identify the watch; changing rules creates a different watch. Repeating the same registration returns existing state without fetching or refreshing it. Reuse the actual returned watch_id; never invent an ID. Registration is free ($0), subject to quotas, and requires no x402 payment client; subsequent comparison tools are paid. Check also accepts url directly and can create its watch during the paid call. No JavaScript execution or background monitoring. For OpenAPI comparisons register the JSON contract without any content rules.
- 2026-10-18 `fresh402_openapi_contract_diff` changed (description)
  - before: Compare a registered public JSON OpenAPI 3.0/3.1 contract against its baseline or previous snapshot. Deterministic structural compatibility evidence; no remote references or LLM.
  - after: Compare a registered public JSON OpenAPI 3.0/3.1 contract against its baseline or previous snapshot. Deterministic structural compatibility evidence; no remote references or LLM. $0.020 USDC.

Full history: https://api.protogrid.dev/v1/servers/io.github.kirillradchenko96%2Ffresh402/changes

## Remotes

- https://fresh402.kirilllabs.workers.dev/mcp (streamable-http, auth none, reachable true, uptime30d 0.9375)

## Packages

_none_

## Tools (5)

- `fresh402_check`: Check whether public HTML, JSON or text changed; use for on-demand freshness checks and a compact deterministic text diff, not background monitoring. Supply exactly one of url or watch_id. A URL-based paid Check can create a watch; an ID reuses its saved URL/rules, so omit all content-rule fields. Reuse returned watch_id/hash for later checks; first URL check without prior state reports changed:null. Optional cache reuse still costs $0.005 USDC per call on Base mainnet (eip155:8453). Requires an x402-capable MCP payment client and funded native-USDC payer; an ordinary MCP client receives a payment challenge, not a paid result. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. No JavaScript execution. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- `fresh402_extract`: Extract readable text, metadata, headings, public links and embedded JSON-LD from one public HTTPS document. Use to read static HTML, JSON or plain text; no watch or prior registration is needed. Optional CSS scope and noise exclusions; max_chars defaults to 20000 and limits returned text, not fetch size. Does not render JavaScript, crawl links or compare versions. $0.010 USDC per call on Base mainnet (eip155:8453), requiring an x402-capable MCP payment client and funded native-USDC payer. An ordinary MCP client receives a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- `fresh402_openapi_contract_diff`: Detect structural compatibility changes in a public JSON OpenAPI 3.0/3.1 contract: paths, methods, parameters, request requirements and response schemas. Use for API contract review; Smart Diff is for general documents. First register the contract URL with free fresh402_register, without selectors or ignore rules, then reuse watch_id. compare_to accepts previous (default) or baseline; an available same-watch previous_hash overrides it. Limits include 256000 decoded document bytes, 100 paths and 500 operations. No YAML, external reference fetching, API-operation execution, LLM or complete compatibility guarantee. $0.020 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.
- `fresh402_register`: Create or retrieve a free persistent baseline for public HTTPS HTML, JSON or plain text. Use before Smart Diff or OpenAPI Contract Diff, or to obtain a reusable watch_id/hash for Check. Required url plus optional CSS/JSON exclusions identify the watch; changing rules creates a different watch. Repeating the same registration returns existing state without fetching or refreshing it. Reuse the actual returned watch_id; never invent an ID. Registration is free ($0), subject to quotas, and requires no x402 payment client; subsequent comparison tools are paid. Check also accepts url directly and can create its watch during the paid call. No JavaScript execution or background monitoring. For OpenAPI comparisons register the JSON contract without any content rules.
- `fresh402_smart_diff`: Explain structured changes in a registered public document: JSON Pointer changes, HTML block changes and deterministic significance hints. Use instead of Check when a changed/unchanged flag or short text diff is insufficient. First obtain watch_id with free fresh402_register; saved URL/rules are reused. compare_to is previous (default) or baseline; previous_hash overrides it when the same-watch snapshot is retained. Up to 200 changes; legacy HTML may have text-only fidelity. No LLM, JavaScript rendering or complete API compatibility guarantee. $0.015 USDC per call on Base mainnet (eip155:8453); requires an x402-capable MCP payment client and funded native-USDC payer, otherwise returns a payment challenge. Alternatively use prepaid credits through REST or this MCP tool: X-Fresh402-API-Key in HTTP, with params._meta["fresh402/prepaid"] containing idempotency_key, tariff_version and max_credits. When root mpp_payments.enabled is true, native MPP EVM charge is another option at the same USDC price: use an authorized Base EIP-712 signer and official mppx client, org.paymentauth/credential metadata and a persisted private recovery token. MPP receipt: org.paymentauth/receipt; see docs/MPP.md. Never combine MPP, prepaid and x402. Discover packages at /v2/prepaid/plans; see docs/AGENT_PREPAID.md for browserless wallet enrollment, bounded early credits and recovery. Optional Circle Gateway x402 is available only when root circle_gateway.enabled is true. Use the GatewayWalletBatched quote, a funded Base Gateway EOA and a persisted private recovery token. Pending batches return 409; replay the original proof/input/token after 60 seconds. Results require Gateway confirmed/completed evidence; never mix providers. No Circle prepaid funding. See docs/CIRCLE_GATEWAY.md.