freetier-agent-api.pages.dev

Live 402 challenge

Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.

{
  "docs": "https://freetier-agent-api.pages.dev/openapi.json",
  "error": "Payment required: $0.0015 USDC on Base. Send PAYMENT-SIGNATURE (x402 v2) or X-PAYMENT (x402 v1). To use your 1 free call, repeat the request with real parameters (example: https://freetier-agent-api.pages.dev/api/gas?chains=all).",
  "policy": "Failed calls are never charged: the payment is verified first, the request runs, and the payment is settled only if it succeeded. Errors (4xx/5xx) are not settled, and invalid input is rejected before any payment or free call.",
  "accepts": [
    {
      "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
      "extra": {
        "name": "USD Coin",
        "version": "2"
      },
      "payTo": "0x165Eb3dC3E98403ecB1141e90400F5e71806554B",
      "scheme": "exact",
      "network": "base",
      "mimeType": "application/json",
      "resource": "https://freetier-agent-api.pages.dev/api/gas",
      "description": "Gas price (5 EVM chains): Live gas prices across 5 EVM chains in one call (Ethereum, Base, Arbitrum, Optimism, Polygon): gas price in gwei, latest block, and the cost of an ETH transfer, an ERC-20/USDC transfer and a swap in native coin and USD, plus a ranking of which chain is cheapest right now. Public RPC nodes with failover; no keys.",
      "outputSchema": {
        "input": {
          "type": "http",
          "method": "GET",
          "queryParams": {
            "chains": {
              "type": "string",
              "description": "\"all\" (default) or a comma list: ethereum,base,arbitrum,optimism,polygon"
            }
          },
          "discoverable": true
        },
        "output": {
          "chains": [
            {
              "block": 37000000,
              "chain": "base",
              "chainId": 8453,
              "estimates": {
                "erc20_transfer": {
                  "gas": 65000,
                  "usd": 0.0012,
                  "native": "0.00000039"
                }
              },
              "nativeCoin": "ETH",
              "gasPriceGwei": 0.006
            }
          ],
          "ranking": [
            "base",
            "optimism",
            "arbitrum",
            "polygon",
            "ethereum"
          ],
          "cheapestForUsdcTransfer": "base"
        }
      },
      "maxAmountRequired": "1500",
      "maxTimeoutSeconds": 300
    }
  ],
  "free_call": "1 free call per route per caller (lifetime), with real parameters; a bare request without parameters always gets this 402.",
  "no_wallet": "No wallet? Buy 1,000 calls by card ($3): https://freetier.gumroad.com/l/gvyfk , then send your Gumroad license key as HTTP header X-License-Key: <key>.",
  "price_usd": 0.0015,
  "price_unit": "per call",
  "pay_by_card": {
    "how": "Buy a credit pack by card (1,000 credits $3, 5,000 $12, 20,000 $40; 1 credit = $0.001), then send header X-License-Key: <your key> on any paid route. Failed calls are never charged; credits do not expire.",
    "url": "https://freetier.gumroad.com/l/gvyfk"
  },
  "verified_by": {
    "tx": "0xac7061becf519224a65e72675e3a70e56d8b7b898cb773007578d958e57a7c18",
    "url": "https://payapi.market/api/freetier-agent-api",
    "name": "PayAPI Market",
    "note": "This route itself has not had a PayAPI test payment; the link is the provider listing.",
    "what": "Verified = PayAPI Market made one settled test payment (USDC on Base) to the route and received a valid response. One test payment per route; it is not an audit, a review or an uptime guarantee. invoice-json is not verified on PayAPI Market yet.",
    "listings": [
      {
        "tx": "0xac7061becf519224a65e72675e3a70e56d8b7b898cb773007578d958e57a7c18",
        "url": "https://payapi.market/api/freetier-agent-api",
        "route": "/api/holidays"
      },
      {
        "tx": "0x515564cbeac0710003a3974a52868e5837359b842cb88f3b8640bf4d3185831e",
        "url": "https://payapi.market/api/agent-extraction-api-token-risk-erc-20-base-ethereum",
        "route": "/api/token-risk"
      },
      {
        "tx": "0x1e6a7906ce26e1b2802c513f5071d5ad2607970af193b736b4424030b25e4735",
        "url": "https://payapi.market/api/agent-extraction-api-site-contacts-company-website-to-contact-row",
        "route": "/api/site-contacts"
      },
      {
        "tx": "0x6b0dd103e9d33f409e800fde77a7e533c986e2a5e79a6a335bc180634bfa9f63",
        "url": "https://payapi.market/api/agent-extraction-api-page-to-rag-web-page-to-markdown-chunks",
        "route": "/api/page-rag"
      },
      {
        "tx": "0x2e133da5bd0cb927ed575f9cbc2512d746b891024986d1aef23bd900d157eb9d",
        "url": "https://payapi.market/api/agent-extraction-api-tx-explain-payment-check-base-ethereum",
        "route": "/api/tx-explain"
      },
      {
        "tx": "0x1d1db3bc3e1d7d7f433e47e2cd21ceea8e8aef72bf57945b19d80026794167b1",
        "url": "https://payapi.market/api/agent-extraction-api-wallet-profile-base-ethereum-address",
        "route": "/api/wallet-profile"
      },
      {
        "tx": "0x54c1b0a1f53e8436f143c3fe288162daf3bccb2e6b5dd09a5bcb57860c4b20ef",
        "url": "https://payapi.market/api/agent-extraction-api-contract-abi-proxy-resolver-base-ethereum",
        "route": "/api/contract-abi"
      },
      {
        "tx": "0x60d1af025e8a5cd38964d1053df8264464ba265b9100d5010b44c856e0d05489",
        "url": "https://payapi.market/api/agent-extraction-api-token-info-usd-price-erc-20-5-chains",
        "route": "/api/token-info"
      },
      {
        "tx": "0x99d1cf63eac473e7370d8806911caaa2d7fdd3cd0fa39fa71458ddca9a585ade",
        "url": "https://payapi.market/api/agent-extraction-api-ens-basenames-resolver-forward-reverse",
        "route": "/api/ens"
      },
      {
        "tx": "0x14ce0ef6b653ed44b9124e2b2d239c3ada0dc797e3d069c929c1585392b8355b",
        "url": "https://payapi.market/api/agent-extraction-api-transaction-status-poller-5-evm-chains",
        "route": "/api/tx-status"
      },
      {
        "tx": "0xdd4a100ee7c49af4b8acd711d06a2287db143682f3e2c09fa57ebbc6cf450b8e",
        "url": "https://payapi.market/api/agent-extraction-api-dns-spf-dmarc-mail-auth-check",
        "route": "/api/dns"
      },
      {
        "tx": "0x3f835455f2f275f22d8b9beb49f02eb050014dac658e5a60f3d38dfa53f46d78",
        "url": "https://payapi.market/api/agent-extraction-api-domain-whois-via-rdap-registrar-expiry",
        "route": "/api/domain-whois"
      },
      {
        "tx": "0x0cea4319e1b01a3b0b52bc4c7ca563c958f891ea237890a4446d69b01187dd55",
        "url": "https://payapi.market/api/agent-extraction-api-ssl-certificate-check-ct-logs-days-left",
        "route": "/api/ssl-cert"
      },
      {
        "tx": "0x45358a14da592ecdb70e8699448bd32e05b3eee9a616093218dbd99cd0225e02",
        "url": "https://payapi.market/api/agent-extraction-api-geocode-reverse-geocode-openstreetmap",
        "route": "/api/geocode"
      }
    ],
    "route_verified": false
  },
  "when_to_use": "Use gas to pick the cheapest EVM chain right now or to price a transfer/swap on Ethereum, Base, Arbitrum, Optimism or Polygon in one call. Use base-gas for Base only.",
  "x402Version": 1,
  "example_output": {
    "chains": [
      {
        "block": 37000000,
        "chain": "base",
        "chainId": 8453,
        "estimates": {
          "erc20_transfer": {
            "gas": 65000,
            "usd": 0.0012,
            "native": "0.00000039"
          }
        },
        "nativeCoin": "ETH",
        "gasPriceGwei": 0.006
      }
    ],
    "ranking": [
      "base",
      "optimism",
      "arbitrum",
      "polygon",
      "ethereum"
    ],
    "cheapestForUsdcTransfer": "base"
  },
  "example_request": {
    "url": "https://freetier-agent-api.pages.dev/api/gas?chains=all",
    "method": "GET"
  },
  "pay_with_any_token": {
    "note": "Each tx hash pays for one call. If the call fails (4xx/5xx) the tx can be reused for a retry of the same route. USDC works this way too.",
    "payTo": "0x165Eb3dC3E98403ecB1141e90400F5e71806554B",
    "quote": "https://freetier-agent-api.pages.dev/api/pay/quote?route=%2Fapi%2Fgas&token=",
    "steps": [
      "GET https://freetier-agent-api.pages.dev/api/pay/quote?route=/api/gas&token=<token address> -> amount (atomic units)",
      "Send that amount with an ERC-20 transfer() to payTo on Base (you pay gas)",
      "Repeat this request with headers X-PAYMENT-TX: <tx hash> and X-PAYMENT-TOKEN: <token address> within 30 minutes"
    ],
    "chains": "Base (default) plus ethereum, arbitrum, optimism, polygon, bsc: add &chain=<name> to the quote and header X-PAYMENT-CHAIN: <name>; token=native pays with the chain coin (ETH/POL/BNB). NFTs are not accepted (no safe free price source).",
    "scheme": "freetier-direct-transfer (non-standard, buyer pays gas)",
    "tokens": "any ERC-20 on Base with >= $10000 DEX liquidity that passes the GoPlus safety filter (no honeypots, no sell blocks, no pausable/owner-controlled balances, tax <= 10%)",
    "network": "eip155:8453"
  }
}

Accepts

The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.

[
  {
    "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
    "extra": {
      "name": "USD Coin",
      "version": "2"
    },
    "payTo": "0x165Eb3dC3E98403ecB1141e90400F5e71806554B",
    "scheme": "exact",
    "network": "eip155:8453",
    "mimeType": "application/json",
    "resource": "https://freetier-agent-api.pages.dev/api/gas",
    "description": "",
    "maxAmountRequired": "1500",
    "maxTimeoutSeconds": 300
  }
]

Provenance

Seen in the source catalog

2026-11-01 07:16Z

Last indexed by Roundhouse

2026-11-07 03:16Z

Last enriched (probe, favicon, geo)

2026-11-03 18:46Z

x402 version

1

Max timeout

300s

Liveness probe

HTTP 402