402Signal
Pay a penny. Get a live paid-API URL — or an honest miss.
TradingLiveeip155:8453Exactvia cdp
x402MppCheckEvidence
Calls · 30d
418↑ 14%
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 25 snapshots so far.
$0.25
Verified settled volume
81 settlements proven x402 by their on-chain EIP-3009 marker.
$0.0030
Listed price
As published in the catalog. Always read the live 402 before paying.
418
Calls · 30d
Upstream's own call count for this endpoint, not ours.
6
Unique payers · 30d
Last called 2026-09-23 13:29Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0xa2604ae688228af8349363770351bfcec66d4fa0The wallet the 402 directs payment to. Its whole payment record — every payer, every chain — is on the merchant page.
Asset 0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913
Provider
The payTo wallet does not resolve to a registered ERC-8004 agent. That is not a verdict on the service — most of the catalog is unregistered.
Live 402 challenge
Captured by the enrichment pass, not read just now. Prices can change — always read the 402 the endpoint answers with.
{
"help": {
"mcp": "https://402signal.com/mcp.json",
"docs": "https://402signal.com/llms.txt",
"post": "POST /route with PAYMENT-SIGNATURE after this 402. Agents should POST, not GET.",
"rails": [
"base",
"solana",
"algorand"
],
"amount": "$0.003",
"contact": "https://x.com/402Signal",
"openapi": "https://402signal.com/openapi.json",
"dashboard": "https://402signal.com/dashboard",
"replayKey": "Send Replay-Key (64 random lowercase hex, private) with the paid request so a lost response can be recovered with Replay-Only: 1 and the same authorization.",
"billingModel": "success_only_v1",
"typedMissesSettled": false,
"settlementCondition": "live_eligible_route_found",
"sellerPaymentSeparate": true
},
"asset": "USDC",
"error": "Payment required",
"payTo": "0xa2604ae688228af8349363770351bfcec66d4fa0",
"amount": "$0.003",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"caip2": "eip155:8453",
"version": "2",
"facilitator": "https://api.cdp.coinbase.com/platform/v2/x402",
"displayAmount": "$0.003"
},
"payTo": "0xa2604ae688228af8349363770351bfcec66d4fa0",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"maxTimeoutSeconds": 60
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"name": "USD Coin",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"facilitator": "https://facilitator.payai.network",
"displayAmount": "$0.003"
},
"payTo": "C8qDYG8NTyvdY85gvGfs1WajwGhiLu6f1vi3JaG1r1iA",
"amount": "3000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"currency": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"maxTimeoutSeconds": 60
},
{
"asset": "31566704",
"extra": {
"tag": "x402-global-challenge",
"name": "USD Coin",
"decimals": 6,
"feePayer": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"facilitator": "https://facilitator.goplausible.xyz",
"displayAmount": "$0.003",
"unsignedGroup": {
"paymentTxn": {
"to": "N2JSJZCSORMYGYO2NSIYRUEMBFRHEOMYODVXV2MXYYHB5H2JVUGG6NJ4NQ",
"fee": 0,
"note": "x402-payment-v2",
"type": "axfer",
"asset": 31566704,
"amount": 3000,
"flatFee": true
},
"feePayerTxn": {
"to": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"fee": 2000,
"from": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"note": "x402-fee-payer",
"type": "pay",
"amount": 0,
"flatFee": true
},
"paymentIndex": 1
},
"suggestedParams": {
"fee": 1000,
"minFee": 1000,
"flatFee": true,
"genesisID": "mainnet-v1.0",
"lastRound": 65256050,
"lastValid": 65256050,
"firstRound": 65255050,
"firstValid": 65255050,
"genesisHash": "wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8="
}
},
"payTo": "N2JSJZCSORMYGYO2NSIYRUEMBFRHEOMYODVXV2MXYYHB5H2JVUGG6NJ4NQ",
"amount": "3000",
"scheme": "exact",
"network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=",
"currency": "31566704",
"maxTimeoutSeconds": 60
}
],
"billing": {
"asset": "USDC",
"model": "success_only_v1",
"condition": "live_eligible_route_found",
"amount_atomic": "3000",
"display_amount": "$0.003",
"typed_misses_settled": false,
"seller_payment_separate": true
},
"network": "base",
"resource": {
"url": "https://402signal.com/route",
"tags": [
"x402",
"mpp",
"check",
"evidence"
],
"mimeType": "application/json",
"description": "402Signal checks the endpoint, price and recipient before your agent pays, on x402 and MPP, and returns a signed record verifiable offline. $0.003 on Base, Solana, and Algorand only when a qualifying live offer is found; a miss is free. Seller payment is separate. Your agent keeps the wallet. Evidence enters the PQ Trust log on Algorand MainNet. require_route_binding=true adds a signed v4 receipt for buyer-side comparison before signing. Guide: https://402signal.com/developers#route-binding",
"serviceName": "402Signal"
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://example.com/x402/balance",
"need": "erc20 token balance"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"url": "https://example.com/x402/balance",
"live": true,
"health": {
"live": true,
"status": 402,
"last_probe": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
},
"status": 402,
"billing": {
"rail": "base",
"asset": "USDC",
"model": "success_only_v1",
"settled": true,
"condition": "live_eligible_route_found",
"amount_atomic": "3000",
"display_amount": "$0.003",
"settlement_state": "settled",
"settlement_attempted": true
},
"probed_at": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"anyOf": [
{
"required": [
"need"
]
},
{
"required": [
"url"
]
}
],
"properties": {
"url": {
"type": "string"
},
"need": {
"type": "string"
},
"require_transparency": {
"type": "boolean",
"description": "Require a durable leaf and signed checkpoint receipt on HTTP 200. Default false; require_route_binding=true also requires transparency. Receipt failure after settlement remains billed. Private replay records support bounded recovery of the original response; they are not long-term evidence storage. Keep your own copy outside public logs."
},
"require_route_binding": {
"type": "boolean",
"description": "Opt in to a signed v4 route binding; implies require_transparency even if false. Default false; ordinary requests keep v3. A ranked winner that cannot bind may fall through to the next already-probed selectable bindable candidate; 503 route_binding_unavailable only when none remain. wrapExactAuthorize reports state=binding_unavailable with keep_calling_route true; policy working, not a crash. Buyer verifies raw response JSON with a pinned log key and compares the current seller request and challenge before signing. Expiry or changed terms do not undo a settled checking fee. Guide: https://402signal.com/developers#route-binding"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"queryParams": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
},
"x402Version": 2
}Accepts
The payment requirements as published to the catalog. Read the live 402 before paying — a price here is a claim, not a quote.
0.003USDC≈ $0.003 USD
on Base · exact scheme
Pay 0.003 USDC on Base to 0xa260…d4fa0. The signed payment is good for 1 minute.
- Paid to
- 0xa260…d4fa0
- USD Coin contract
- 0x8335…02913
- Payment window
- 1 minute
- As published
- 3000 smallest units
3000units
on solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- C8qDYG…1r1iA
- Token contract
- EPjFWd…TDt1v
- Payment window
- 1 minute
3000units
on algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8= · exact scheme
That figure is in the token’s smallest units. Roundhouse does not hold this contract’s decimals, so it is shown as published rather than converted.
- Paid to
- N2JSJZ…NJ4NQ
- Token contract
- 31566704
- Payment window
- 1 minute
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"caip2": "eip155:8453",
"version": "2",
"facilitator": "https://api.cdp.coinbase.com/platform/v2/x402",
"displayAmount": "$0.003"
},
"payTo": "0xa2604ae688228af8349363770351bfcec66d4fa0",
"amount": "3000",
"scheme": "exact",
"network": "eip155:8453",
"currency": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"maxTimeoutSeconds": 60
},
{
"asset": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"extra": {
"name": "USD Coin",
"feePayer": "CjNFTjvBhbJJd2B5ePPMHRLx1ELZpa8dwQgGL727eKww",
"facilitator": "https://facilitator.payai.network",
"displayAmount": "$0.003"
},
"payTo": "C8qDYG8NTyvdY85gvGfs1WajwGhiLu6f1vi3JaG1r1iA",
"amount": "3000",
"scheme": "exact",
"network": "solana:5eykt4UsFv8P8NJdTREpY1vzqKqZKvdp",
"currency": "EPjFWdd5AufqSSqeM2qN1xzybapC8G4wEGGkZwyTDt1v",
"maxTimeoutSeconds": 60
},
{
"asset": "31566704",
"extra": {
"tag": "x402-global-challenge",
"name": "USD Coin",
"decimals": 6,
"feePayer": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"facilitator": "https://facilitator.goplausible.xyz",
"displayAmount": "$0.003",
"unsignedGroup": {
"paymentTxn": {
"to": "N2JSJZCSORMYGYO2NSIYRUEMBFRHEOMYODVXV2MXYYHB5H2JVUGG6NJ4NQ",
"fee": 0,
"note": "x402-payment-v2",
"type": "axfer",
"asset": 31566704,
"amount": 3000,
"flatFee": true
},
"feePayerTxn": {
"to": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"fee": 2000,
"from": "ZMFK2OI7ZBD2U27ISERZC4S6LKM6WMFJPZQ4MYNJDZ2VNBNMBA67RA22AA",
"note": "x402-fee-payer",
"type": "pay",
"amount": 0,
"flatFee": true
},
"paymentIndex": 1
},
"suggestedParams": {
"fee": 1000,
"minFee": 1000,
"flatFee": true,
"genesisID": "mainnet-v1.0",
"lastRound": 65351834,
"lastValid": 65351834,
"firstRound": 65350834,
"firstValid": 65350834,
"genesisHash": "wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8="
}
},
"payTo": "N2JSJZCSORMYGYO2NSIYRUEMBFRHEOMYODVXV2MXYYHB5H2JVUGG6NJ4NQ",
"amount": "3000",
"scheme": "exact",
"network": "algorand:wGHE2Pwdvd7S12BL5FaOP20EGYesN73ktiC1qzkkit8=",
"currency": "31566704",
"maxTimeoutSeconds": 60
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"url": "https://example.com/x402/balance",
"need": "erc20 token balance"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"url": "https://example.com/x402/balance",
"live": true,
"health": {
"live": true,
"status": 402,
"last_probe": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
},
"status": 402,
"billing": {
"rail": "base",
"asset": "USDC",
"model": "success_only_v1",
"settled": true,
"condition": "live_eligible_route_found",
"amount_atomic": "3000",
"display_amount": "$0.003",
"settlement_state": "settled",
"settlement_attempted": true
},
"probed_at": "2026-08-29T22:00:00-04:00",
"latency_ms": 87,
"has_402_challenge": true
}
}
},
"schema": {
"type": "object",
"$schema": "https://json-schema.org/draft/2020-12/schema",
"required": [
"input"
],
"properties": {
"input": {
"type": "object",
"required": [
"type",
"method",
"bodyType",
"body"
],
"properties": {
"body": {
"type": "object",
"anyOf": [
{
"required": [
"need"
]
},
{
"required": [
"url"
]
}
],
"properties": {
"url": {
"type": "string"
},
"need": {
"type": "string"
},
"require_transparency": {
"type": "boolean",
"description": "Require a durable leaf and signed checkpoint receipt on HTTP 200. Default false; require_route_binding=true also requires transparency. Receipt failure after settlement remains billed. Private replay records support bounded recovery of the original response; they are not long-term evidence storage. Keep your own copy outside public logs."
},
"require_route_binding": {
"type": "boolean",
"description": "Opt in to a signed v4 route binding; implies require_transparency even if false. Default false; ordinary requests keep v3. A ranked winner that cannot bind may fall through to the next already-probed selectable bindable candidate; 503 route_binding_unavailable only when none remain. wrapExactAuthorize reports state=binding_unavailable with keep_calling_route true; policy working, not a crash. Buyer verifies raw response JSON with a pinned log key and compares the current seller request and challenge before signing. Expiry or changed terms do not undo a settled checking fee. Guide: https://402signal.com/developers#route-binding"
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"headers": {
"type": "object",
"additionalProperties": {
"type": "string"
}
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
},
"queryParams": {
"type": "object",
"additionalProperties": {
"type": "string"
}
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"type": "object"
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-24 13:28Z
- Last indexed by Roundhouse
- 2026-09-24 18:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-21 12:15Z
- x402 version
- 2
- Max timeout
- 60s
- Liveness probe
- HTTP 402
Hand this page to an agent
Copy the prompt and paste it into Claude, an MCP client or your own agent — it will vet this service and call it over the free read API. No key, no account.
GET api.roundhouseai.io/v0/endpoints
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 25 snapshots so far. Verified volume counts only settlements with an on-chain EIP-3009 marker.
Show the promptHide the prompt
Using Roundhouse, look up the x402 service 402Signal and tell me whether it is worth paying: what a call costs, whether the endpoint answered when last probed, and what its payment record actually shows. curl -s 'https://api.roundhouseai.io/v0/endpoints?q=402Signal' curl -s 'https://api.roundhouseai.io/v0/merchants/<the payTo wallet returned above>' Then call it: read the price from the live 402 at https://402signal.com/route, never from a cached figure, and pay with an x402 client. The /v0 API needs an API key (`authorization: Bearer rh_live_…`) on everything except /v0/unified* and /v0/endpoints. Mint a personal key for $0.01 at GET https://api.roundhouseai.io/v0/test/x402, or use an organization key from https://roundhouseai.io/dashboard/team. If you do not have Roundhouse tools or skills installed, read https://roundhouseai.io/skill.md first — it is the whole procedure.