x402meta.hergertsynthora.com
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InferenceLiveeip155:8453Exactvia cdp
Calls · 30d
5
This endpoint's own trailing-30-day call count, as published by the upstream catalog and snapshotted daily. 12 snapshots so far.
$1.06
Verified settled volume
131 settlements proven x402 by their on-chain EIP-3009 marker.
$0.010
Listed price
As published in the catalog. Always read the live 402 before paying.
5
Calls · 30d
Upstream's own call count for this endpoint, not ours.
3
Unique payers · 30d
Last called 2026-09-17 03:55Z
—
Upstream on-chain volume
Reported by the source catalog.
Paid to
0x6D9F318463168fF637b50E5b9a21392e97c7c167The 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.
{
"error": "Payment required",
"accepts": [
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://x402meta.hergertsynthora.com/service",
"description": "x402 preflight / reputation — verify BEFORE you pay. Give it an x402 endpoint_url (or a payTo address) and it returns, in one cheap deterministic call: is the resource reachable, is it present in the CDP Bazaar discovery catalog (serviceName, declared payTo, price, network, tags, last_seen), and — the key integrity check — does the payTo the endpoint actually demands in its live HTTP 402 challenge MATCH the payTo the catalog advertises (payTo_match). It runs a keyless HEAD/OPTIONS/402 probe that never moves funds, extracts the real payTo/amount/asset/network from the challenge, scores listing freshness, and — if you pass a prev snapshot {payTo,amount,lastUpdated} — flags whether the endpoint changed since you last saw it (anti-rug). Output is a 0-100 scorecard + letter grade + reason codes + an actionable verdict (pay_ok / caution / do_not_pay). For any router, wallet agent or M2M client that pays third-party x402 endpoints and needs to avoid paying a hijacked, dead, or repriced resource. Deterministic, no LLM, Ed25519-signed. 0.01 USDC via x402 on Base. SYNTHORA.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
}
],
"freeTier": {
"note": "send header X-WALLET: 0x<your Base address> for a free trial",
"header": "X-WALLET",
"callsPerWallet": 3
},
"resource": {
"url": "https://x402meta.hergertsynthora.com/service",
"mimeType": "application/json",
"description": "x402 preflight / reputation — verify BEFORE you pay. Give it an x402 endpoint_url (or a payTo address) and it returns, in one cheap deterministic call: is the resource reachable, is it present in the CDP Bazaar discovery catalog (serviceName, declared payTo, price, network, tags, last_seen), and — the key integrity check — does the payTo the endpoint actually demands in its live HTTP 402 challenge MATCH the payTo the catalog advertises (payTo_match). It runs a keyless HEAD/OPTIONS/402 probe that never moves funds, extracts the real payTo/amount/asset/network from the challenge, scores listing freshness, and — if you pass a prev snapshot {payTo,amount,lastUpdated} — flags whether the endpoint changed since you last saw it (anti-rug). Output is a 0-100 scorecard + letter grade + reason codes + an actionable verdict (pay_ok / caution / do_not_pay). For any router, wallet agent or M2M client that pays third-party x402 endpoints and needs to avoid paying a hijacked, dead, or repriced resource. Deterministic, no LLM, Ed25519-signed. 0.01 USDC via x402 on Base. SYNTHORA."
},
"extensions": {
"bazaar": {
"info": {
"input": {
"body": {
"endpoint_url": "https://api.exa.ai/search"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"niche": "x402meta",
"result": {
"host": "api.exa.ai",
"payTo": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"signed": true,
"catalog": {
"payTo": "0x6d6E695b09861467c7d462f5AAF31cF3540B9192",
"amount": "7000",
"network": "eip155:8453",
"resource": "https://api.exa.ai/search",
"last_seen": "2026-07-07T21:49:52.202Z",
"matched_by": "endpoint",
"serviceName": "exa-search"
},
"changed": null,
"verdict": "pay_ok",
"reachable": true,
"scorecard": {
"grade": "B",
"score": 88,
"changed": null,
"reachable": true,
"in_catalog": true,
"payTo_match": true,
"reason_codes": [
"reachable",
"in_catalog",
"emits_402",
"payto_match",
"challenge_wellformed",
"listing_fresh"
],
"listing_age_days": 1,
"requires_payment": true,
"challenge_wellformed": true
},
"in_catalog": true,
"payTo_live": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"payTo_match": true,
"endpoint_url": "https://api.exa.ai/search",
"final_status": 402,
"live_challenge": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x6d6E695b09861467c7d462f5AAF31cF3540B9192",
"amount": "7000",
"network": "eip155:8453"
},
"payTo_declared": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"service_version": "1.0",
"requires_payment": 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": [
"endpoint_url"
]
},
{
"required": [
"payTo"
]
}
],
"properties": {
"prev": {
"type": "object",
"properties": {
"payTo": {
"type": "string"
},
"amount": {
"type": "string"
},
"lastUpdated": {
"type": "string"
}
},
"description": "Optional prior snapshot to detect change (anti-rug)."
},
"payTo": {
"type": "string",
"description": "A payTo address (0x…40hex) to look up in the catalog instead of / in addition to a URL."
},
"endpoint_url": {
"type": "string",
"description": "The x402 endpoint URL to preflight (http/https). Either this or payTo is required."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"ok": {
"type": "boolean"
},
"type": "object",
"niche": {
"type": "string"
}
}
}
}
}
}
}
},
"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.
0.01USDC≈ $0.01 USD
on Base · exact scheme
Pay 0.01 USDC on Base to 0x6D9F…7c167. The signed payment is good for 5 minutes.
- Paid to
- 0x6D9F…7c167
- USD Coin contract
- 0x8335…02913
- Payment window
- 5 minutes
- As published
- 10000 smallest units
- Buys
- x402 preflight / reputation — verify BEFORE you pay. Give it an x402 endpoint_url (or a payTo address) and it returns, in one cheap deterministic call: is the resource reachable, is it present in the CDP Bazaar discovery catalog (serviceName, declared payTo, price, network, tags, last_seen), and — the key integrity check — does the payTo the endpoint actually demands in its live HTTP 402 challenge MATCH the payTo the catalog advertises (payTo_match). It runs a keyless HEAD/OPTIONS/402 probe that never moves funds, extracts the real payTo/amount/asset/network from the challenge, scores listing freshness, and — if you pass a prev snapshot {payTo,amount,lastUpdated} — flags whether the endpoint changed since you last saw it (anti-rug). Output is a 0-100 scorecard + letter grade + reason codes + an actionable verdict (pay_ok / caution / do_not_pay). For any router, wallet agent or M2M client that pays third-party x402 endpoints and needs to avoid paying a hijacked, dead, or repriced resource. Deterministic, no LLM, Ed25519-signed. 0.01 USDC via x402 on Base. SYNTHORA.
- Returns
- application/json
The catalog’s raw entry
[
{
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"extra": {
"name": "USD Coin",
"version": "2"
},
"payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167",
"amount": "10000",
"scheme": "exact",
"network": "eip155:8453",
"mimeType": "application/json",
"resource": "https://x402meta.hergertsynthora.com/service",
"description": "x402 preflight / reputation — verify BEFORE you pay. Give it an x402 endpoint_url (or a payTo address) and it returns, in one cheap deterministic call: is the resource reachable, is it present in the CDP Bazaar discovery catalog (serviceName, declared payTo, price, network, tags, last_seen), and — the key integrity check — does the payTo the endpoint actually demands in its live HTTP 402 challenge MATCH the payTo the catalog advertises (payTo_match). It runs a keyless HEAD/OPTIONS/402 probe that never moves funds, extracts the real payTo/amount/asset/network from the challenge, scores listing freshness, and — if you pass a prev snapshot {payTo,amount,lastUpdated} — flags whether the endpoint changed since you last saw it (anti-rug). Output is a 0-100 scorecard + letter grade + reason codes + an actionable verdict (pay_ok / caution / do_not_pay). For any router, wallet agent or M2M client that pays third-party x402 endpoints and needs to avoid paying a hijacked, dead, or repriced resource. Deterministic, no LLM, Ed25519-signed. 0.01 USDC via x402 on Base. SYNTHORA.",
"maxAmountRequired": "10000",
"maxTimeoutSeconds": 300
}
]Extensions
{
"bazaar": {
"info": {
"input": {
"body": {
"endpoint_url": "https://api.exa.ai/search"
},
"type": "http",
"method": "POST",
"bodyType": "json"
},
"output": {
"type": "json",
"example": {
"ok": true,
"niche": "x402meta",
"result": {
"host": "api.exa.ai",
"payTo": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"signed": true,
"catalog": {
"payTo": "0x6d6E695b09861467c7d462f5AAF31cF3540B9192",
"amount": "7000",
"network": "eip155:8453",
"resource": "https://api.exa.ai/search",
"last_seen": "2026-07-07T21:49:52.202Z",
"matched_by": "endpoint",
"serviceName": "exa-search"
},
"changed": null,
"verdict": "pay_ok",
"reachable": true,
"scorecard": {
"grade": "B",
"score": 88,
"changed": null,
"reachable": true,
"in_catalog": true,
"payTo_match": true,
"reason_codes": [
"reachable",
"in_catalog",
"emits_402",
"payto_match",
"challenge_wellformed",
"listing_fresh"
],
"listing_age_days": 1,
"requires_payment": true,
"challenge_wellformed": true
},
"in_catalog": true,
"payTo_live": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"payTo_match": true,
"endpoint_url": "https://api.exa.ai/search",
"final_status": 402,
"live_challenge": {
"asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
"payTo": "0x6d6E695b09861467c7d462f5AAF31cF3540B9192",
"amount": "7000",
"network": "eip155:8453"
},
"payTo_declared": "0x6d6e695b09861467c7d462f5aaf31cf3540b9192",
"service_version": "1.0",
"requires_payment": 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": [
"endpoint_url"
]
},
{
"required": [
"payTo"
]
}
],
"properties": {
"prev": {
"type": "object",
"properties": {
"payTo": {
"type": "string"
},
"amount": {
"type": "string"
},
"lastUpdated": {
"type": "string"
}
},
"description": "Optional prior snapshot to detect change (anti-rug)."
},
"payTo": {
"type": "string",
"description": "A payTo address (0x…40hex) to look up in the catalog instead of / in addition to a URL."
},
"endpoint_url": {
"type": "string",
"description": "The x402 endpoint URL to preflight (http/https). Either this or payTo is required."
}
}
},
"type": {
"type": "string",
"const": "http"
},
"method": {
"enum": [
"POST",
"PUT",
"PATCH"
],
"type": "string"
},
"bodyType": {
"enum": [
"json",
"form-data",
"text"
],
"type": "string"
}
},
"additionalProperties": false
},
"output": {
"type": "object",
"required": [
"type"
],
"properties": {
"type": {
"type": "string"
},
"example": {
"ok": {
"type": "boolean"
},
"type": "object",
"niche": {
"type": "string"
}
}
}
}
}
}
}
}Provenance
- Seen in the source catalog
- 2026-09-17 03:55Z
- Last indexed by Roundhouse
- 2026-09-24 20:10Z
- Last enriched (probe, favicon, geo)
- 2026-09-14 10:45Z
- x402 version
- 2
- Max timeout
- 300s
- 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. 12 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 x402meta.hergertsynthora.com 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=x402meta.hergertsynthora.com' 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://x402meta.hergertsynthora.com/service, 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.