Horizon Pulse

Horizon Pulse Agent utilities API

Tools for agents working with x402.

GitHub OpenAPI

Operations 19

GET /api/x402-check Audit any x402 endpoint without paying it #
GET /api/x402-check/deep Live deep check of an x402 endpoint and its payTo #
GET /api/bazaar-check Check whether an x402 seller is listed in CDP Bazaar, and why not #
GET /api/market/search Find a paid x402 API for a task, re-checked live #
GET /api/market/quote Check an x402 seller's live price and payTo before paying #
GET /api/tx-status Did my transaction land, and is it final (4 chains) #
GET /api/watch Did this page or endpoint change since my last check #
GET /api/balance Can my wallet pay x402 calls right now (4 rails) #
GET /api/tx-guard Check a recipient address before sending: allow / warn / block from four… #
GET /api/grocery/normalize Turn recipe ingredient lines into a normalized shopping list #
POST /api/grocery/normalize Turn recipe ingredient lines into a normalized shopping list #
GET /api/grocery/ingredient Look up nutrition per 100 g for an ingredient or barcode #
POST /api/grocery/ingredient Look up nutrition per 100 g for an ingredient or barcode #
GET /api/chain/head Current block, slot or ledger height on 5 chains #
GET /api/token/meta Token name, symbol, decimals and supply from chain state #
GET /api/name/resolve Resolve an ENS name or Basename, or find an address's primary name #
GET /api/batch Up to 10 chain checks (balance, gas, tx status, token, chain head, names) for… #
POST /api/batch Up to 10 chain checks (balance, gas, tx status, token, chain head, names) for… #
GET /api/discourse/split How Hacker News and Bluesky posts split on a question (not a poll) #

Specifications

⚙
OpenAPI
https://artifacts.apis.io/horizonpulse-dev/openapi/horizonpulse-dev-agent-utilities-api-openapi.yml

Schemas & Data

📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-market-search-response-schema.json
📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-x402-check-deep-response-schema.json
📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-market-quote-response-schema.json
📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-bazaar-check-response-schema.json
📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-balance-response-schema.json
📊
JSONSchema
https://artifacts.apis.io/horizonpulse-dev/json-schema/horizonpulse-dev-grocery-normalize-response-schema.json

Other Resources

🔗
APIsJSON
https://artifacts.apis.io/horizonpulse-dev/apis.yml

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OpenAPI Specification

horizonpulse-dev-agent-utilities-api-openapi.yml Raw ↑ 
openapi: 3.2.0
info:
  title: Horizon Pulse Agent utilities API
  version: 1.1.0
  termsOfService: https://horizonpulse.dev/terms/buyer
  summary: Pay-per-call APIs for AI agents, settled in USDC on Base, Solana or Polygon, or RLUSD on the XRP Ledger, with x402.
  description: 'Pay-per-call APIs for AI agents, paid in USDC on Base, Solana or Polygon, or RLUSD on the XRP Ledger, with x402: web search, page fetch and extract, PDF to text, an HTTP proxy, and crypto market data. No signup or API key.


    On Base, you only pay for a successful response; errors are not charged except where an operation says so (for /api/tx-status, a not_found status is a charged answer; poll again after pollAgainSeconds). These no-charge statements are made for USDC on Base. On USDC on Solana, and RLUSD on the XRP Ledger, a refused or failed request may still be charged. charged: false means Horizon Pulse did not settle the payment; on USDC on Solana, and RLUSD on the XRP Ledger, this is not a guarantee that no funds moved. Every paid operation carries `x-payment-info` with the exact price, asset, network and payTo of its Base entry; these match the 402 challenge and https://horizonpulse.dev/.well-known/x402. The 402 challenge also offers the same price in USDC on Solana mainnet (`exact`, network solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp, USDC mint EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v, payTo BjY98A6dS3GGLZdz2zHy8wK7XAwnQgNhCc66mfmBTRPz, PayAI facilitator https://facilitator.payai.network), and in native USDC on Polygon PoS mainnet (`exact`, network eip155:137, USDC 0x3c499c542cEF5E3811e1192ce70d8cC03d5c3359, payTo 0x5b32c973596078a967562ca652761404f19be0e9, facilitator: Coinbase CDP), and in RLUSD on the XRP Ledger mainnet (`exact`, network xrpl:0, currency RLUSD = 524C555344000000000000000000000000000000, issuer rMxCKbEDwqr76QuheSUMdEGf4B9xJ8m5De, payTo r3FbirL83RAB2CwnUdxE5pCohMkuo6LQcf, verified on the validated ledger). Recorded example responses (fixed input, dated, informational; not paid operations): GET /api/demo/{route}.


    Agent integration: step-by-step skill at https://horizonpulse.dev/skill.md; guide with MCP setup at https://horizonpulse.dev/agents (hosted MCP at https://horizonpulse.dev/mcp for x402-aware clients, plus a local stdio MCP server in the repo''s mcp/ folder that pays from your own wallet with spend caps).


    Services for API owners (web pages, not API operations; not paid via x402): Bazaar listing fix at https://horizonpulse.dev/listing-fix; agent promotion at https://horizonpulse.dev/agent-promotion.'
  contact:
    name: Horizon Pulse
    email: horizonpulse.co@proton.me
    url: https://horizonpulse.dev
  x-guidance: 'Read PAYMENT-REQUIRED (base64 JSON). Pay exact USDC on Base (CDP), Solana (PayAI feePayer), Polygon, or RLUSD on XRPL at the listed payTo. Unpaid samples: /api/demo/{route}. Skill: /skill.md. Hosted MCP: /mcp (Base USDC only).'
servers:
- url: https://horizonpulse.dev
  description: Production
security:
- x402: []
tags:


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# Full source: https://artifacts.apis.io/horizonpulse-dev/openapi/horizonpulse-dev-agent-utilities-api-openapi.yml