# x402 Agent Tools
> Twelve pay-per-call HTTP endpoints for AI agents, paid per request in USDC on Base or Solana with the x402 protocol: Solana and Base token risk checks, web page to Markdown, URL status, EVM selector decoding, crypto, LLM and GPU prices, DNS lookup and utilities. From $0.001 a call, no API key or account, never charged for failed or invalid requests.

x402 Agent Tools is a service from GPT Shop Ltd, a UK limited company registered in England and Wales (company no. 15766335), Goodison Middleton, Winterslow, Salisbury SP5 1QR. Contact: chris@gptshopltd.com.

## Pricing
- GET /v1/solana/token-risk: $0.01 USD, Rug and risk check for a Solana SPL or Token-2022 mint: authorities, metadata mutability, top-10 holders, DEX liquidity, age and a verdict (example: https://api.gptshopltd.com/v1/solana/token-risk?mint=DezXAZ8z7PnrnRJjz3wXBoRgixCa6xjnB7YaB1pPB263).
- GET /v1/base/token-risk: $0.01 USD, Honeypot, tax and owner-privilege flags for an ERC-20 on Base, plus holders, liquidity, pool age and a verdict (example: https://api.gptshopltd.com/v1/base/token-risk?address=0x833589fcd6edb6e08f4c7c32d4f71b54bda02913).
- GET /v1/web/markdown: $0.005 USD, Main content of a web page as clean Markdown, with title, byline, date and word count (example: https://api.gptshopltd.com/v1/web/markdown?url=https://en.wikipedia.org/wiki/HTTP_402).
- GET /v1/web/status: $0.002 USD, Is a URL up? Final status, redirect chain, time to first byte and content type (example: https://api.gptshopltd.com/v1/web/status?url=https://example.com).
- GET /v1/evm/4byte: $0.002 USD, Decode an EVM function selector or raw calldata to its most likely signature (example: https://api.gptshopltd.com/v1/evm/4byte?selector=0xa9059cbb).
- GET /v1/crypto/price: $0.002 USD, USD spot price, 24h change, market cap and volume for up to 25 assets (CoinGecko) (example: https://api.gptshopltd.com/v1/crypto/price?q=sol,btc,eth).
- GET /v1/prices/llm: $0.002 USD, Current per-million-token prices for about 300 LLMs (OpenRouter public list) (example: https://api.gptshopltd.com/v1/prices/llm?q=gpt-4o).
- GET /v1/prices/gpu: $0.002 USD, On-demand GPU rental prices per hour by model (Vast.ai public marketplace) (example: https://api.gptshopltd.com/v1/prices/gpu?q=H100).
- GET /v1/dns/lookup: $0.001 USD, Live A, AAAA, TXT, MX, CNAME or NS records via Cloudflare DNS-over-HTTPS (example: https://api.gptshopltd.com/v1/dns/lookup?name=example.com&type=MX).
- GET /v1/util/ping: $0.001 USD, Cheapest paid call. Use it to test your x402 client end to end.
- GET /v1/util/uuid: $0.001 USD, Random UUID v4 values, 1 to 100 per call (example: https://api.gptshopltd.com/v1/util/uuid?n=5).
- GET /v1/util/time: $0.001 USD, Current UTC time, optionally in an IANA timezone (example: https://api.gptshopltd.com/v1/util/time?tz=Europe/London).

Prices are per successful call in USD, settled in USDC on Base (eip155:8453) or Solana mainnet. Payments are verified and settled by the PayAI facilitator; invalid input returns HTTP 400 before any payment is taken.

## How to call it
1. Send a normal GET to a route. The server answers HTTP 402 Payment Required with the price, network and payTo address in the payment-required header.
2. An x402 client (for example @x402/fetch) signs the exact USDC amount and retries with the payment attached.
3. The route runs; settlement happens only on a 2xx response.

## Machine-readable discovery
- OpenAPI 3.1: https://api.gptshopltd.com/openapi.json
- x402 resource list: https://api.gptshopltd.com/.well-known/x402
- JSON endpoint list: GET https://api.gptshopltd.com/ without a text/html Accept header
- Custom endpoints and support: hello@gptshopltd.com

## Related
- MintCheck (human Solana token check): https://mintcheck.gptshopltd.com/
- SolLedger (Solana tax CSV): https://solledger.gptshopltd.com/

## FAQ

### Do I need an API key or an account?
No. Each request is paid on its own with the x402 protocol. Your agent gets an HTTP 402 with the price, signs a USDC payment and retries. That is the whole sign-up.

### Which networks and tokens?
USDC on Base and USDC on Solana. Payments are verified and settled by the PayAI facilitator, so you only pay for calls that return a 2xx.

### Am I charged for bad input?
No. Invalid input returns HTTP 400 before any payment is taken.

### Is there a free tier?
No free calls, but the utility routes cost $0.001, which is one tenth of a US cent.

### Where does the data come from?
Public sources named on each route: Solana and Base RPC, DexScreener, GoPlus, Sourcify and 4byte.directory, CoinGecko, OpenRouter, Vast.ai and Cloudflare DNS. Results are cached for a few minutes at most.

### Can I get a custom endpoint?
Yes. Email hello@gptshopltd.com with what your agent needs and the price you would pay per call.

## Links
- Home: https://api.gptshopltd.com/
- Other GPT Shop Ltd services: https://tools.gptshopltd.com/