# What does this x402 endpoint charge? **0.003000 USDC per request** on `eip155:8453` · risk LOW (100/100, v1) ## ENDPOINT | Field | Value | | ----------- | ------------------------------------------- | | URL | https://keyronne.com/api/chain-tx | | Canonical | https://keyronne.com/api/chain-tx | | Endpoint id | 26c44e558c55a266c50008c715c0fd07 | | HTTP status | 402 | | Latency | 86 ms | | Redirects | 0 | | TLS | handshake ok | | Wire form | both the v2 header and a v1 body | | Bytes read | 2083 | | Observed at | 2026-08-15T15:14:23Z | | Decoder | accepted — decodePaymentRequired from tx402 | ## PAYMENT These terms were accepted by the strict decoder tx402 uses before it pays. | Field | Value | | ----------------------- | ------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------------- | | Price | 0.003000 USDC | | Amount (atomic) | 3000 | | Scheme | exact | | Network | eip155:8453 · in the tx402 signed manifest | | Asset | USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 · in the manifest | | Pay to | 0xB86F95EF5FA904318Ea9Df3b59AdCe099b478fC4 | | Pay to declared dynamic | no | | Authorization window | 60s | | Resource | https://keyronne.com/api/chain-tx | | MIME type | application/json | | Description | Look up a transaction and its receipt on Ethereum, Base, Arbitrum, Optimism, Polygon, or BNB Chain: status (success/reverted/pending), from/to, value, block, nonce, gas used and price, log count, and any contract created. Public JSON-RPC, no API keys. POST a JSON body like: {"chain":"base","hash":"0xb498053e345acd227657ef2e3de7d9fd9b861d673368419c4b18cfaea20365c8"} | | Facilitator | not observed | ## OBSERVED | Field | Value | | ------------------ | -------------------- | | First seen | 2026-08-15T04:00:12Z | | Last seen | 2026-08-15T15:14:23Z | | Scans recorded | 3 | | Availability (30d) | not measured yet | | Latency p50 | not measured yet | | Changed at | What changed | | -------------------- | ----------------------------------------------------------------------------------------------- | | 2026-08-15T06:15:28Z | first_seen: challenge_hash — → 569557d64a5005a15ca78ad19bf21c682fa03a9c33d7e3e9107654498380b1fc | ## SECURITY 17 checks ran and none failed. A check that could not run reports `skip` and is never counted as a pass. | Check | Detail | | ---------------------------------- | -------------------------------------------------------------- | | pass wire_form_detected | Served as both. | | pass base64_strict | The strict decoder accepted the header's base64 framing. | | pass json_wellformed | — | | pass x402_version_known | Declared x402Version 2. | | pass accepts_present | The challenge offers one way to pay. | | pass size_within_limit | Read 2083 bytes, within the probe's cap. | | pass network_caip2_wellformed | network: eip155:8453 | | pass network_recognized | Recognized means present in the tx402 signed release manifest. | | pass asset_recognized | Recognized means present in the tx402 signed release manifest. | | pass amount_atomic_canonical | — | | pass amount_positive | — | | pass pay_to_wellformed | — | | pass max_timeout_sane | — | | pass resource_origin_match | — | | pass scheme_known | — | | skip facilitator_known | The challenge named no facilitator. | | pass mime_type_wellformed | mimeType: application/json | | pass extra_wellformed | `extra` carries 2 field(s), preserved verbatim. | | skip amount_within_observed_range | No prior observations of this endpoint. | | skip recipient_matches_observed | No prior observations of this endpoint. | ## RISK — LOW (100/100) score_version `v1` · confidence `static_only` · 12 signals scored A band describes how much of what we check we were able to confirm. It is not a judgement about the operator of an endpoint. | Signal | Weight Finding | | ------------------------------- | ------------------------------------------------------------------------------------- | | pass challenge_decodes | 25 The challenge decodes under the strict x402 decoder tx402 uses before paying. | | pass resource_origin_match | 15 The challenge describes the endpoint that served it. | | pass amount_canonical | 12 The amount is a canonical atomic integer. | | pass pay_to_wellformed | 12 The recipient is a well-formed address for the declared network. | | pass network_recognized | 8 The network is in the tx402 signed release manifest. | | pass asset_recognized | 8 The asset is in the tx402 signed release manifest for this network. | | skip facilitator_known | 0 The challenge named no facilitator. | | pass scheme_known | 6 The payment scheme is one tx402 can route. | | pass tls_ok | 5 The endpoint was reached over a valid TLS connection. | | pass timeout_sane | 4 The authorization window is within the maximum tx402 will sign for. | | pass redirect_scheme_downgrade | 3 No redirect downgraded the connection. | | pass wire_form | 3 The endpoint serves the x402 v2 header form. | | pass amount_magnitude_band | 2 The amount is within the range we see for x402 endpoints. | Methodology: https://tools.tx402.io/methodology?v=v1 ## TEST WITH TX402 Nothing below sends a key anywhere. tx402 commits policy and budget before the signer is reachable, so a refusal is a payment that was never authorized. ```bash npx tx402 call "https://keyronne.com/api/chain-tx" \ --max-spend "0.003000 USDC" \ --network "eip155:8453" \ --dry-run # --dry-run stops after the policy decision. Nothing is signed and nothing is spent. ``` ```ts import { createTx402Client } from "tx402"; // Your signer stays in your process. tools.tx402.io never sees a key, // never asks for one, and cannot build a payment. import { signers } from "./signers.js"; const tx402 = createTx402Client({ signers, policy: { maxPerRequest: "0.003000 USDC", allowedDomains: ["keyronne.com"], allowedNetworks: ["eip155:8453"], }, }); // Policy and budget are committed before the signer is reachable, so a // refusal here is a payment that was never authorized. const response = await tx402.fetch("https://keyronne.com/api/chain-tx"); ``` ```python from tx402 import Tx402Client, Policy # Your signer stays in your process. tools.tx402.io never sees a key, # never asks for one, and cannot build a payment. tx402 = Tx402Client( evm_signer=evm, policy=Policy( max_per_request="0.003000 USDC", allowed_domains=["keyronne.com"], allowed_networks=["eip155:8453"], ), ) # Policy and budget are committed before the signer is reachable, so a # refusal here is a payment that was never authorized. response = tx402.fetch("https://keyronne.com/api/chain-tx") ``` --- | Representation | URL | | -------------- | --- | | HTML | https://tools.tx402.io/inspect?url=https%3A%2F%2Fkeyronne.com%2Fapi%2Fchain-tx | | Markdown | https://tools.tx402.io/inspect.md?url=https%3A%2F%2Fkeyronne.com%2Fapi%2Fchain-tx | | JSON | https://tools.tx402.io/api/v1/inspect?url=https%3A%2F%2Fkeyronne.com%2Fapi%2Fchain-tx | | History | https://tools.tx402.io/history?url=https%3A%2F%2Fkeyronne.com%2Fapi%2Fchain-tx | Decoded by `tx402@0.2.0` — the same strict decoder the SDK runs before it pays.