# X402 Helper MCP

> API discovery and x402 paid execution via MCP. Search by natural-language, call with USDC payment

- name: xyz.x402helper/mcp
- version: 1.0.0
- connection class: R0 (autonomous)
- trust: 80/100 flags: no-repository
- quality: 67/100 (needs work)
- owner: not claimed
- descriptor: https://api.protogrid.dev/v1/servers/xyz.x402helper%2Fmcp
- tools: https://api.protogrid.dev/v1/servers/xyz.x402helper%2Fmcp/tools

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

## Connection (mcpServers)

```json
{
  "mcpServers": {
    "x402helper": {
      "type": "http",
      "url": "https://x402helper.xyz/mcp"
    }
  }
}
```


## Trust

- hygiene: 80
- liveness: 100
- freshness: 100
- provenance: 45
- drivers: +dns-namespace +reachable +uptime-100% +updated-17d-ago -no-repository
- Derived from observable signals (official registry feed and our own credential-free probes); no code audit performed.

## Quality 67/100 (needs work)

### protocol: 75 (weight 25)

- warn `protocol.modern`: newest supported version is 2025-06-18; 2026-07-28 not supported, older versions are deprecated until 2027-07-28
- n/a `protocol.stateless`: only applies to 2026-07-28 servers
- pass `protocol.transport`: streamable HTTP
- n/a `protocol.list_ttl`: only applies to 2026-07-28 servers

### 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: 69 (weight 30)

- pass `tools.descriptions`: every tool has a description
- warn `tools.description_length`: 2 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: top_up_balance (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); call_endpoint (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); get_day_summary (readOnlyHint, destructiveHint, idempotentHint, openWorldHint); …
- pass `tools.token_cost`: about 2,425 tokens to load every tool
- pass `tools.api_dump`: tools are not a one-to-one API dump
- pass `tools.hidden_text`: no hidden text in tool names, descriptions, schemas or annotations

### stability: 50 (weight 15)

- warn `stability.changes`: 30 tool changes in 30 days
- fail `stability.rug_pull`: 1 tools kept their name but changed most of their description in 30 days; review before trusting them
- pass `stability.new_links`: no tool change named a new site

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

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

- tools: 6, about 2,425 tokens to load them all
- tool set hash: 55ae4f1809a0a0c4dfb7a87694ff4f9b
- tools last changed: 2026-11-10T14:01:11.349Z
- badge: [![protogrid quality](https://protogrid.dev/badge/xyz.x402helper/mcp.svg)](https://protogrid.dev/servers/xyz.x402helper/mcp)
- Checks run on what our credential-free, read-only probes observe; tools are never called and no code audit is performed.

### Tool changes

- 2026-11-10 `top_up_balance` changed (description)
  - before: Top up your agent balance to speed up paid requests: when it covers tool/endpoint price, calls are charged directly from balance without the 402 challenge flow. Call once without payment - the response will contain `accepts` to sign, then retry with the signed payment. On success returns meta.historyUrl and meta.yourID - use it as `X-Buyer-Id` header on subsequent calls to our paid tools or endpoints to use balance. Note: free probes limited to 15 calls / 10 min per IP. Call it if you plan to use our tools regularly, skip it if not.
  - after: Top up your agent balance to speed up paid requests. The `amount` you pay here is not a per-call price: it is added to your balance and is drawn down across many future calls like the `call_endpoint` or `buy_gift_cards` tools. When the balance covers the tool/endpoint price, calls are charged directly from balance without the 402 challenge flow; a partial balance still yields a 402 for the shortfall - sign and retry as usual. Call once without payment - the response will contain `accepts` to sign, then retry with the signed payment. On success returns meta.historyUrl and meta.yourID - use it as `X-Buyer-Id` header on subsequent calls to our paid tools or endpoints to use balance. Note: free probes limited to 15 calls / 10 min per IP. Call it if you plan to use our tools regularly, skip it if not.
- 2026-11-10 `get_my_history` changed (description)
  - before: Get your full account data: balance, digital purchases and paid calls. Use it when you need to audit, verify, or summarize what paid calls you have made - e.g. to check spend, find purchased codes, confirm a past payment settled, or list your recent endpoints or their parameters. Unlike other tools, this is the account-wide, cross-route, cross-time audit view keyed by `buyerID`, which is a bearer-style secret: it both authorizes charges against your prepaid `balance` (no 402 challenge when balance covers price) and unlocks this history. Treat it like a password - do not log it or share it. Tool returns aggregate counters plus per-route events (timestamp, endpoint, network, amount, facilitator, params). Free, read-only. Not a real-time payment-status probe - eventually-consistent history. Rate limit per IP: 15 calls / 10 min, exceeding → 429. User can also view it in a browser at https://x402helper.xyz/getmyhistory.html page.
  - after: Get your full account data: balance, digital purchases and paid calls. Use it when you need to audit your account: check balance, verify, or summarize what paid calls you have made - e.g. to check spend, find purchased codes, confirm a past payment settled, or list your recent endpoints or their parameters. Unlike other tools, this is the account-wide audit view keyed by `buyerID`, which is a bearer-style secret: it both authorizes charges against your prepaid `balance` (no 402 challenge when balance covers price) and unlocks this history. Treat it like a password - do not log it or share it. Tool returns aggregate counters plus per-route events (timestamp, endpoint, network, amount, facilitator, params). Free, read-only. Not a real-time payment-status probe - eventually-consistent history. Rate limit per IP: 15 calls / 10 min, exceeding → 429. User can also view it in a browser at https://x402helper.xyz/getmyhistory.html page.
- 2026-11-10 `buy_gift_cards` changed (description, inputSchema)
  - before: Simple direct way to buy a digital gift card (Amazon, Steam, Apple, Netflix, Google Play, PlayStation, Xbox, IKEA, Airbnb, …) via natural language. Describe what you want in `prompt`, e.g. "steam 25 USD" or "amazon 50 euro germany". If country is omitted, US is used as default. Minimal card nominal is $1. The product and denomination are matched automatically: the closest package for the requested value is selected. Note: the card nominal is not the final charge - expect a deviation. The exact amount is shown in the 402 `accepts` - compare it against your request before signing. Flow: first call WITHOUT a payment signature returns isError=true with `x402Version` + `accepts` in structuredContent (the price is computed dynamically from the product and denomination you asked for). Sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). On success returns the redemption code(s) under `structuredContent.redemption`, or `structuredContent.delivery="pending"` if not delivered yet - codes then appear later in `get_my_history` under `orders["gift-cards"][productKey]` (string for one code, array for several). If the product cannot be resolved or fails after you paid, the call is refunded automatically (structuredContent.refunded=true). Limits per IP: 12 free probes/h, then paid calls 300/5min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
  - after: Simple direct way to buy a digital gift card (Amazon, Steam, Apple, Netflix, Google Play, PlayStation, Xbox, IKEA, Airbnb, …) via natural language. Describe what you want in `prompt`, e.g. "steam 25 USD" or "amazon 50 euro germany". If country is omitted, US is used as default. Minimal card nominal is $1. The product and denomination are matched automatically: the closest package for the requested value is selected. Note: the card nominal is not the final charge - expect a deviation. The exact amount is shown in the 402 `accepts` - compare it against your request before signing. Flow: if you have a balance (see `top_up_balance`) and it covers the price, pass `buyerID` next to `prompt` - payment is taken from balance, no 402 challenge, so it is much faster. Otherwise the first call WITHOUT a payment signature returns isError=true with `x402Version` + `accepts` in structuredContent (the price is computed dynamically from the product and denomination you asked for). Sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). On success returns the redemption code(s) under `structuredContent.redemption`, or `structuredContent.delivery="pending"` if not delivered yet - codes then appear later in `get_my_history` under `orders["gift-cards"][productKey]` (string for one code, array for several). If the product cannot be resolved or fails after you paid, the call is refunded automatically (structuredContent.refunded=true). Limits per IP: 12 free probes/h, then paid calls 300/5min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
- 2026-11-10 `get_day_summary` changed (description)
  - before: Fast and simple way to get morning brief in one call: weather, S&P 500 / Dow / NASDAQ, BTC/ETH/SOL with 24h change, top-5 news. Use it when the user asks for a daily brief, morning digest, market+weather snapshot, or "what's happening today. Do NOT use for single-fact lookups or for tickers/coins/countries outside the fixed set - use search_endpoints → call_endpoint instead. Free, read-only. Rate limit: 20 calls / 5 min per agent (key = x-agent-id, else ip:user-agent), exceeding → 429 + Retry-After as errors[].retryAfter.
  - after: Fast and simple way to get morning brief in one call: weather, S&P 500 / Dow / NASDAQ, BTC/ETH/SOL with 24h change, top-5 news. Use it when the user asks for a daily brief, morning digest, market+weather snapshot, or what is happening today. Do NOT use for single-fact lookups or for tickers/coins/countries outside the fixed set - use search_endpoints → call_endpoint instead. Free, read-only. Rate limit: 20 calls / 5 min per agent (key = x-agent-id, else ip:user-agent), exceeding → 429 + Retry-After as errors[].retryAfter.
- 2026-11-10 `call_endpoint` changed (description, inputSchema)
  - before: Executes an endpoint found via search_endpoints. Pass `routeId` and `arguments` (keys = `parameters[].name` of that route, omit if the route has none). If payment is required, returns isError=true with `x402Version`+`accepts` in structuredContent - sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). Other isError cases: `invalid_arguments` (structuredContent.details[]/requiredArgs[] tell what to fix and retry), `route_unresolved` (pick another routeId from plan[]), `failed` (refunded/refundTx; try another route). On success, returns the actual result of the endpoint. No auth. Limits (per IP): paid 300/5min, burst 200/10s, total 1000/15min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
  - after: Executes an endpoint found via search_endpoints. Pass `routeId` and `arguments` (keys = `parameters[].name` of that route, omit if the route has none). Flow: if you have a balance (see `top_up_balance`) and it covers the route price, pass `buyerID` next to `routeId` (not inside arguments - that object is forwarded to the endpoint) - payment is taken from balance, no 402 challenge, so it is much faster. Otherwise the first call WITHOUT a payment signature returns isError=true with `x402Version`+`accepts` in structuredContent - sign those accepts and retry with `_meta["x402/payment"]` (base64 payload); a partial balance still yields a 402 for the shortfall. Other isError cases: `invalid_arguments` (structuredContent.details[]/requiredArgs[] tell what to fix and retry), `route_unresolved` (pick another routeId from plan[]), `failed` (refunded/refundTx; try another route). On success, returns the actual result of the endpoint. No auth. Limits (per IP): paid 300/5min, burst 200/10s, total 1000/15min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
- 2026-11-08 `topup_balance` removed
  - Top up your agent balance (USDC, min 0.01, max 1000) to speed up paid requests: when it covers tool/endpoint price, calls are charged directly from balance without the 402 challenge flow. Call once without payment - the response will contain `accepts` to sign, then retry with the signed payment. On success returns meta.historyUrl and meta.yourID - use it as `X-Buyer-Id` header on subsequent calls to our paid tools or endpoints to use balance. Note: free probes limited to 15 calls / 10 min per IP. Call it if you plan to use our tools regularly, skip it if not.
- 2026-11-08 `top_up_balance` added
  - Top up your agent balance to speed up paid requests: when it covers tool/endpoint price, calls are charged directly from balance without the 402 challenge flow. Call once without payment - the response will contain `accepts` to sign, then retry with the signed payment. On success returns meta.historyUrl and meta.yourID - use it as `X-Buyer-Id` header on subsequent calls to our paid tools or endpoints to use balance. Note: free probes limited to 15 calls / 10 min per IP. Call it if you plan to use our tools regularly, skip it if not.
- 2026-11-08 `get_my_history` changed (description, outputSchema)
  - before: Access to your full account data: balance, digital purchases and paid calls. Use it when you need to audit, verify, or summarize what paid calls you have made - e.g. to check spend, find purchased codes, confirm a past payment settled, or list your recent endpoints or their parameters. Returns aggregate counters plus per-route events (timestamp, endpoint, network, amount, facilitator, params). No payment required. Free, read-only. Rate limit: 15 calls / 10 min per IP, exceeding → 429. User can also view it in a browser at https://x402helper.xyz/getmyhistory.html page.
  - after: Get your full account data: balance, digital purchases and paid calls. Use it when you need to audit, verify, or summarize what paid calls you have made - e.g. to check spend, find purchased codes, confirm a past payment settled, or list your recent endpoints or their parameters. Unlike other tools, this is the account-wide, cross-route, cross-time audit view keyed by `buyerID`, which is a bearer-style secret: it both authorizes charges against your prepaid `balance` (no 402 challenge when balance covers price) and unlocks this history. Treat it like a password - do not log it or share it. Tool returns aggregate counters plus per-route events (timestamp, endpoint, network, amount, facilitator, params). Free, read-only. Not a real-time payment-status probe - eventually-consistent history. Rate limit per IP: 15 calls / 10 min, exceeding → 429. User can also view it in a browser at https://x402helper.xyz/getmyhistory.html page.
- 2026-11-08 `buy_gift_cards` changed (description, inputSchema)
  - before: Simple direct way to buy a digital gift card (Amazon, Steam, Apple, Netflix, Google Play, PlayStation, Xbox, IKEA, Airbnb, …) via natural language. Describe what you want in `prompt`, e.g. "steam 25 USD" or "amazon 50 euro germany". If country is omitted, US is used as default. Minimal card nominal is $1. The product and denomination are matched automatically: the closest package for the requested value is selected. Note: the card nominal is not the final charge - expect a deviation. The exact amount is shown in the 402 `accepts` - compare it against your request before signing. Flow: first call WITHOUT a payment signature returns isError=true with `x402Version` + `accepts` in structuredContent (the price is computed dynamically from the product and denomination you asked for). Sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). On success returns the redemption code(s) under `structuredContent.redemption`, or `structuredContent.delivery="pending"` if not delivered yet - codes then appear later in `get_my_history` under `orders["gift-cards"][productKey]` (string for one code, array for several). If the product cannot be resolved or fails after you paid, the call is refunded automatically (structuredContent.refunded=true). Limits per IP: 12 free probes/h, then paid calls 300/5min. Tip: see the `topup_balance` tool description to learn how to speed up processing of your calls via balance.
  - after: Simple direct way to buy a digital gift card (Amazon, Steam, Apple, Netflix, Google Play, PlayStation, Xbox, IKEA, Airbnb, …) via natural language. Describe what you want in `prompt`, e.g. "steam 25 USD" or "amazon 50 euro germany". If country is omitted, US is used as default. Minimal card nominal is $1. The product and denomination are matched automatically: the closest package for the requested value is selected. Note: the card nominal is not the final charge - expect a deviation. The exact amount is shown in the 402 `accepts` - compare it against your request before signing. Flow: first call WITHOUT a payment signature returns isError=true with `x402Version` + `accepts` in structuredContent (the price is computed dynamically from the product and denomination you asked for). Sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). On success returns the redemption code(s) under `structuredContent.redemption`, or `structuredContent.delivery="pending"` if not delivered yet - codes then appear later in `get_my_history` under `orders["gift-cards"][productKey]` (string for one code, array for several). If the product cannot be resolved or fails after you paid, the call is refunded automatically (structuredContent.refunded=true). Limits per IP: 12 free probes/h, then paid calls 300/5min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
- 2026-11-08 `get_day_summary` changed (description)
  - before: Fast and simple way to get morning brief in one call: weather, S&P 500 / Dow / NASDAQ, BTC/ETH/SOL with 24h change, top-5 news.Use it when the user asks for a daily brief, morning digest, market+weather snapshot, or "what's happening today. Do NOT use for single-fact lookups or for tickers/coins/countries outside the fixed set - use search_endpoints → call_endpoint instead.Free, read-only. Rate limit: 20 calls / 5 min per agent (key = x-agent-id, else ip:user-agent), exceeding → 429 + Retry-After as errors[].retryAfter.
  - after: Fast and simple way to get morning brief in one call: weather, S&P 500 / Dow / NASDAQ, BTC/ETH/SOL with 24h change, top-5 news. Use it when the user asks for a daily brief, morning digest, market+weather snapshot, or "what's happening today. Do NOT use for single-fact lookups or for tickers/coins/countries outside the fixed set - use search_endpoints → call_endpoint instead. Free, read-only. Rate limit: 20 calls / 5 min per agent (key = x-agent-id, else ip:user-agent), exceeding → 429 + Retry-After as errors[].retryAfter.

Full history: https://api.protogrid.dev/v1/servers/xyz.x402helper%2Fmcp/changes

## Remotes

- https://x402helper.xyz/mcp (streamable-http, auth none, reachable true, uptime30d 1)

## Packages

_none_

## Tools (6)

- `buy_gift_cards`: Simple direct way to buy a digital gift card (Amazon, Steam, Apple, Netflix, Google Play, PlayStation, Xbox, IKEA, Airbnb, …) via natural language. Describe what you want in `prompt`, e.g. "steam 25 USD" or "amazon 50 euro germany". If country is omitted, US is used as default. Minimal card nominal is $1. The product and denomination are matched automatically: the closest package for the requested value is selected. Note: the card nominal is not the final charge - expect a deviation. The exact amount is shown in the 402 `accepts` - compare it against your request before signing. Flow: if you have a balance (see `top_up_balance`) and it covers the price, pass `buyerID` next to `prompt` - payment is taken from balance, no 402 challenge, so it is much faster. Otherwise the first call WITHOUT a payment signature returns isError=true with `x402Version` + `accepts` in structuredContent (the price is computed dynamically from the product and denomination you asked for). Sign those accepts and retry with `_meta["x402/payment"]` (base64 payload). On success returns the redemption code(s) under `structuredContent.redemption`, or `structuredContent.delivery="pending"` if not delivered yet - codes then appear later in `get_my_history` under `orders["gift-cards"][productKey]` (string for one code, array for several). If the product cannot be resolved or fails after you paid, the call is refunded automatically (structuredContent.refunded=true). Limits per IP: 12 free probes/h, then paid calls 300/5min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
- `call_endpoint`: Executes an endpoint found via search_endpoints. Pass `routeId` and `arguments` (keys = `parameters[].name` of that route, omit if the route has none). Flow: if you have a balance (see `top_up_balance`) and it covers the route price, pass `buyerID` next to `routeId`  (not inside arguments - that object is forwarded to the endpoint) - payment is taken from balance, no 402 challenge, so it is much faster. Otherwise the first call WITHOUT a payment signature returns isError=true with `x402Version`+`accepts` in structuredContent - sign those accepts and retry with `_meta["x402/payment"]` (base64 payload); a partial balance still yields a 402 for the shortfall. Other isError cases: `invalid_arguments` (structuredContent.details[]/requiredArgs[] tell what to fix and retry), `route_unresolved` (pick another routeId from plan[]), `failed` (refunded/refundTx; try another route). On success, returns the actual result of the endpoint. No auth. Limits (per IP): paid 300/5min, burst 200/10s, total 1000/15min. Tip: see the `top_up_balance` tool description to learn how to speed up processing of your calls via balance.
- `get_day_summary`: Fast and simple way to get morning brief in one call: weather, S&P 500 / Dow / NASDAQ, BTC/ETH/SOL with 24h change, top-5 news. Use it when the user asks for a daily brief, morning digest, market+weather snapshot, or what is happening today. Do NOT use for single-fact lookups or for tickers/coins/countries outside the fixed set - use search_endpoints → call_endpoint instead. Free, read-only. Rate limit: 20 calls / 5 min per agent (key = x-agent-id, else ip:user-agent), exceeding → 429 + Retry-After as errors[].retryAfter.
- `get_my_history`: Get your full account data: balance, digital purchases and paid calls. Use it when you need to audit your account: check balance, verify, or summarize what paid calls you have made - e.g. to check spend, find purchased codes, confirm a past payment settled, or list your recent endpoints or their parameters. Unlike other tools, this is the account-wide audit view keyed by `buyerID`, which is a bearer-style secret: it both authorizes charges against your prepaid `balance` (no 402 challenge when balance covers price) and unlocks this history. Treat it like a password - do not log it or share it. Tool returns aggregate counters plus per-route events (timestamp, endpoint, network, amount, facilitator, params). Free, read-only. Not a real-time payment-status probe - eventually-consistent history. Rate limit per IP: 15 calls / 10 min, exceeding → 429. User can also view it in a browser at https://x402helper.xyz/getmyhistory.html page.
- `search_endpoints`: FREE search for paid API endpoints (x402) by task. Pass either a natural-language query (the planner will split it) or pre-split queries[]. Returns a structured plan with up to `maxRoutesPerQuery` candidates per sub-query. No auth. Limits: burst 200/10s, total 1000/15min per IP; free probes 10/h per IP, 20/h per agent. IMPORTANT: Do not fetch `route.url` directly. To execute the preferred route, call `call_endpoint({ routeId, arguments })` - `routeId` from `plan[].routes[].routeId`, `arguments` keys = `parameters[].name` of that route.
- `top_up_balance`: Top up your agent balance to speed up paid requests. The `amount` you pay here is not a per-call price: it is added to your balance and is drawn down across many future calls like the `call_endpoint` or `buy_gift_cards` tools. When the balance covers the tool/endpoint price, calls are charged directly from balance without the 402 challenge flow; a partial balance still yields a 402 for the shortfall - sign and retry as usual. Call once without payment - the response will contain `accepts` to sign, then retry with the signed payment. On success returns meta.historyUrl and meta.yourID - use it as `X-Buyer-Id` header on subsequent calls to our paid tools or endpoints to use balance. Note: free probes limited to 15 calls / 10 min per IP. Call it if you plan to use our tools regularly, skip it if not.