# What does this x402 endpoint charge? **0.010000 USDC per request** on `eip155:8453` · risk LOW (96/100, v1) ## ENDPOINT | Field | Value | | ----------- | ------------------------------------------- | | URL | https://readx.sh/api/:name | | Canonical | https://readx.sh/api/:name | | Endpoint id | 9356d9ece20226974bef3dc9c39f04f8 | | HTTP status | 402 | | Latency | 9 ms | | Redirects | 0 | | TLS | handshake ok | | Wire form | x402 v2 — PAYMENT-REQUIRED header | | Bytes read | 2 | | Observed at | 2026-08-15T15:14:37Z | | Decoder | accepted — decodePaymentRequired from tx402 | ## PAYMENT These terms were accepted by the strict decoder tx402 uses before it pays. | Field | Value | | ----------------------- | ---------------------------------------------------------------------- | | Price | 0.010000 USDC | | Amount (atomic) | 10000 | | Scheme | exact | | Network | eip155:8453 · in the tx402 signed manifest | | Asset | USDC 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913 · in the manifest | | Pay to | 0x13E060ADcc6F4b731Da8382B333027B8B2bfF707 | | Pay to declared dynamic | no | | Authorization window | 300s | | Resource | https://readx.sh/api/:name | | MIME type | application/json | | Description | A user's timeline: tweets, retweets and quotes. Example: GET /api/jack | | Facilitator | not observed | This endpoint offers 2 ways to pay. The report describes the first, which is the order the server stated its own preference in. | # | Requirement | | - | ---------------------------------------------------------------------- | | 1 | 0.010000 USDC · eip155:8453 · exact | | 2 | 10000 (atomic units) · solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact | ## OBSERVED | Field | Value | | ------------------ | -------------------- | | First seen | 2026-08-15T04:00:12Z | | Last seen | 2026-08-15T15:14:37Z | | Scans recorded | 3 | | Availability (30d) | not measured yet | | Latency p50 | not measured yet | | Changed at | What changed | | -------------------- | ----------------------------------------------------------------------------------------------- | | 2026-08-15T06:00:58Z | first_seen: challenge_hash — → b48d3ff8e343b709ace6359b49cdd07e68c2581636580f2d2c7f5cbac4ae641d | ## SECURITY 0 failed, 1 warned, 16 passed. A check that could not run reports `skip` and is never counted as a pass. | Check | Detail | | ---------------------------------- | -------------------------------------------------------------- | | pass wire_form_detected | Served as v2-header. | | 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 2 ways to pay. | | pass size_within_limit | Read 2 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 | — | | warn max_timeout_sane | Authorization window 300s exceeds the tx402 maximum of 60s. | | 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 (96/100) 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. | | warn timeout_sane | 4 The authorization window is outside 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://readx.sh/api/:name" \ --max-spend "0.010000 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: "0.010000 USDC", allowedDomains: ["readx.sh"], 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://readx.sh/api/:name"); ``` ```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="0.010000 USDC", allowed_domains=["readx.sh"], 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://readx.sh/api/:name") ``` --- | Representation | URL | | -------------- | --- | | HTML | https://tools.tx402.io/inspect?url=https%3A%2F%2Freadx.sh%2Fapi%2F%3Aname | | Markdown | https://tools.tx402.io/inspect.md?url=https%3A%2F%2Freadx.sh%2Fapi%2F%3Aname | | JSON | https://tools.tx402.io/api/v1/inspect?url=https%3A%2F%2Freadx.sh%2Fapi%2F%3Aname | | History | https://tools.tx402.io/history?url=https%3A%2F%2Freadx.sh%2Fapi%2F%3Aname | Decoded by `tx402@0.2.0` — the same strict decoder the SDK runs before it pays.