x402 List

x402 Protocol Service Directory

SYNTHORA Keyless Web Search

Data PAYMENT-READY imported

payment-ready until 2026-08-20

imported from the x402 Bazaar, not submitted by the operator · own this service? claim it · or ask to be removed

Web search API for agents: send a natural-language query and get ranked organic results (title, url, snippet) from DuckDuckGo and public SearXNG instances, with an optional extract of the top result as markdown. No search API key needed. 0.005 USDC per call on Base.

Pay from $0.05 per request in USDC on Base, settled onchain via the x402 protocol, no signup, no API key needed.

first settlement 2026-06-29 · $0.05 all-time · settled via coinbase, payAI

BASE URL https://websearch.hergertsynthora.com ENDPOINTS 1 NETWORK Base ASSET USDC MEMBER SINCE 2026-07-20 MONITORED SINCE 2026-07-20

ASSESSMENT

updated 4h ago

Evidence-backed signals, not a single score. Click any chip for the proof. Measured values stay read-only; unknown is honest.

reliability 95.7%
uptime 24h
100%
uptime 7d
100%
uptime 30d
95.7%
uptime 90d
95.7%
response p95
1618ms
avg response
1213ms
total checks
2,131

Measured on the unpaid 402 handshake, not the paid call. A service can 402 correctly and still fail after payment.

compliance A (14/14)

14 of 14 x402 conformance checks pass. Full checklist below.

jump to compliance checklist

price $0.05 (p84 in Data)
price (min)
$0.05
category percentile (min)
p84 in Data
endpoints / prices
1 / 1
model
flat
stability
0%
risk clean

No deterministic risk flag. Risk fires only on an exact blocklist match, or a reserved-brand name with a mismatched verified payTo. Never from low uptime, a high price, or a model guess.

domain age
-
registrar
-
hosting
custom
domain created
---

Identity facts, not a risk score.

traction $0.0225606061 30d · 11 buyers
volume 30d
$0.0225606061
buyers 30d
11
settlements 30d
103
first settlement
2026-06-29
last settlement
2026-08-13
top buyer share
85% of 30d volume
trend 7d vs 30d
3.93x the 30d daily rate
networks
eip155:8453
volume all-time
$0.05
settlements all-time
232
median settlement 30d
$0.001
max settlement 30d
$0.10
settled via
coinbase ($1.44, 102 tx), payAI ($0.05, 1 tx)

Attributed pro-quota: this payout address is shared, so volume is the operator-level figure divided by the services sharing it, while buyer and transaction counts stay whole. A declared convention, not an individually observed measure, and still a conservative undercount.

Currently sharing this payout address with Agent Card Validator (A2A), Crypto 24h Trading Stats (Binance data), Crypto Fear & Greed Index, Crypto OHLCV Candles (Binance data), DEX Token Price (GeckoTerminal data), Email Deliverability Audit (SPF, DKIM, DMARC), FX Exchange Rates (ECB), German VAT Number Validator (SYNTHORA), Global Crypto Market Stats (CoinGecko data), Hyperliquid Perps Snapshot, iCalendar (.ics) Generator, LEI Lookup (GLEIF), Order Book Liquidity (Binance depth), Perp Funding Rates (Binance data), Polymarket Prediction Markets Feed, Public Holidays API (Nager.Date), SYNTHORA Address Risk Screen, SYNTHORA Agent Capability Attestation, SYNTHORA Agent Pre-Trade Safety, SYNTHORA AML Wallet Screen, SYNTHORA Base Block Metrics, SYNTHORA BIC/SWIFT Check, SYNTHORA Bridge Risk Evaluator, SYNTHORA Contract Code Check (eth_getCode), SYNTHORA Contract Guard, SYNTHORA Contract Watch, SYNTHORA Counterparty Risk Verdict, SYNTHORA Crypto News Sentiment, SYNTHORA DeFi Data (Hyperliquid perp feed), SYNTHORA DeFi Strategy Verdict, SYNTHORA Derivatives Intel Bundle, SYNTHORA DNS + WHOIS Domain Report, SYNTHORA ENS Resolver, SYNTHORA ERC-20 Token Balance, SYNTHORA Forex Rates (ECB), SYNTHORA FX Exchange Rates, SYNTHORA Gas & MEV Oracle, SYNTHORA IBAN Check, SYNTHORA Inference Router, SYNTHORA Liquidation Risk Signal (Aave v3), SYNTHORA Mailcheck, SYNTHORA MCP Server Security Scan, SYNTHORA MEV Exposure Detector, SYNTHORA MTA-STS Audit, SYNTHORA Native Balance (eth_getBalance), SYNTHORA Open Interest Oracle, SYNTHORA Pre-Sign Transaction Verdict, SYNTHORA Routing Check, Synthora RPC Contract Metadata, SYNTHORA RPC Network Metadata, SYNTHORA RPC Proxy Detect, SYNTHORA RPC Receipt, SYNTHORA RPC Transaction by Hash, SYNTHORA Slippage Oracle, SYNTHORA Stablecoin Peg Monitor, SYNTHORA Stablecoin Supply, SYNTHORA Token Risk, SYNTHORA Translate, SYNTHORA Trending Coins, SYNTHORA Tx Intent Classifier, SYNTHORA Wallet Reputation Score, SYNTHORA x402 Endpoint Preflight, SYNTHORA x402 Registry Watch, VIN Decoder (NHTSA vPIC), Wikipedia Article Summary.

Top buyer share is a concentration signal, not part of the ranking score.

CHANGES

3 events, detecting since 2026-07-24

Payout, price, and schema changes detected on this service's x402 wire. A payout rotation at an unchanged price shows up here even when nothing else moves. Full feed at /changes.

changes price changed 9d ago (3 since 2026-07-24)

price changed · 9d ago

POST /service · eip155:8453 · USDC: 500050000

price changed · 9d ago

POST /service · eip155:8453 · USDC: 200005000

price changed · 12d ago

POST /service · eip155:8453 · USDC: 500020000

Amounts are on-wire atomic units in the named asset.

see all changes for this service

WHAT IT DOES

ai-derived

Provides keyless web search for AI agents, returning ranked organic results from multiple sources.

category
web-search
in
body
auth
none
web-searchai-agentsorganic-resultsmulti-source

AI-generated summary. The measured data is never altered by it.

ENDPOINTS

Service endpoints with HTTP method, path, description, pricing, and network
METHOD PATH DESCRIPTION PRICE NETWORK ASSET 402 CHANNEL
POST /service Keyless web search for AI agents. Give it a natural-language query and it returns ranked organic results (title, url, snippet) drawn from live multi-source search (DuckDuckGo HTML/Lite plus public SearXNG instances, with automatic fallback so it never returns empty when one source flakes). Optionally it also fetches the top result and extracts the main content as clean, token-budgeted markdown (answer_extract), so an agent can read the page without running its own crawler, browser or scraper. Use it to answer real-world questions, gather fresh facts, research a topic, find documentation or check what a site says, without maintaining a search index or paying for Google/Bing/Serper API keys. Resilient (short timeouts, multi-source), SSRF-hardened, 0.005 USDC on Base. $0.05 Base USDC header
1 endpoints

REQUEST / RESPONSE EXAMPLE

An unpaid request to POST /service returns HTTP 402 with the payment terms. Settle onchain via your facilitator, then retry with the X-Payment header.

// request
curl -i -X POST 'https://websearch.hergertsynthora.com/service'
// 402 response (captured by monitor) · 1 payload · click to expand
[
  {
    "error": "Payment required",
    "accepts": [
      {
        "asset": "0x833589fCD6eDb6E08f4c7C32D4f71b54bdA02913",
        "extra": {
          "name": "USD Coin",
          "version": "2"
        },
        "payTo": "0x10800a5a5B9d72251566EC651E862A8b4B427dE0",
        "amount": "50000",
        "scheme": "exact",
        "network": "eip155:8453",
        "mimeType": "application/json",
        "resource": "https://api.hergertsynthora.com/v1/websearch",
        "description": "Keyless web search for AI agents. Give it a natural-language query and it returns ranked organic results (title, url, snippet) drawn from live multi-source search (DuckDuckGo HTML/Lite plus public SearXNG instances, with automatic fallback so it never returns empty when one source flakes). Optionally it also fetches the top result and extracts the main content as clean, token-budgeted markdown (answer_extract), so an agent can read the page without running its own crawler, browser or scraper. Use it to answer real-world questions, gather fresh facts, research a topic, find documentation or check what a site says, without maintaining a search index or paying for Google/Bing/Serper API keys. Resilient (short timeouts, multi-source), SSRF-hardened, 0.005 USDC on Base.",
        "maxAmountRequired": "50000",
        "maxTimeoutSeconds": 300
      }
    ],
    "resource": {
      "url": "https://api.hergertsynthora.com/v1/websearch",
      "mimeType": "application/json",
      "description": "Keyless web search for AI agents. Give it a natural-language query and it returns ranked organic results (title, url, snippet) drawn from live multi-source search (DuckDuckGo HTML/Lite plus public SearXNG instances, with automatic fallback so it never returns empty when one source flakes). Optionally it also fetches the top result and extracts the main content as clean, token-budgeted markdown (answer_extract), so an agent can read the page without running its own crawler, browser or scraper. Use it to answer real-world questions, gather fresh facts, research a topic, find documentation or check what a site says, without maintaining a search index or paying for Google/Bing/Serper API keys. Resilient (short timeouts, multi-source), SSRF-hardened, 0.005 USDC on Base."
    },
    "x402Version": 2
  }
]

OVER TIME

All charts use the 90d selector; each series spans only the dates it has data for. Every series is also served as JSON at /api/v1/services/synthora-keyless-web-search/price, /scores, /volume and /buyers. On-chain volume and distinct buyers are measured over the service's settlement address and are a conservative undercount (only settlements that reach a measured facilitator are counted). The on-chain series roll up hourly, so the latest day can be up to about an hour behind; distinct buyers are counted per payout address, so a service that settles to more than one address is an upper bound.

UPTIME
07-20 · uptime 84.6% · 701ms avg07-21 · uptime 86.7% · 2288ms avg07-22 · uptime 93.3% · 1550ms avg07-23 · uptime 71.1% · 2847ms avg07-24 · uptime 82.2% · 2152ms avg07-31 · uptime 93.3% · 1388ms avg08-02 · uptime 88.9% · 804ms avg08-03 · uptime 92.2% · 1218ms avg07-20 · uptime 84.6% · 701ms avg07-21 · uptime 86.7% · 2288ms avg07-22 · uptime 93.3% · 1550ms avg07-23 · uptime 71.1% · 2847ms avg07-24 · uptime 82.2% · 2152ms avg07-25 · uptime 100.0% · 1408ms avg07-26 · uptime 100.0% · 1480ms avg07-27 · uptime 96.7% · 1279ms avg07-28 · uptime 98.9% · 1040ms avg07-29 · uptime 100.0% · 1034ms avg07-30 · uptime 97.8% · 1065ms avg07-31 · uptime 93.3% · 1388ms avg08-01 · uptime 100.0% · 1214ms avg08-02 · uptime 88.9% · 804ms avg08-03 · uptime 92.2% · 1218ms avg08-04 · uptime 98.9% · 900ms avg08-05 · uptime 100.0% · 1111ms avg08-06 · uptime 100.0% · 705ms avg08-07 · uptime 100.0% · 1021ms avg08-08 · uptime 100.0% · 1053ms avg08-09 · uptime 100.0% · 965ms avg08-10 · uptime 100.0% · 940ms avg08-11 · uptime 100.0% · 760ms avg08-12 · uptime 100.0% · 815ms avg08-13 · uptime 100.0% · 587ms avg07-2008-13
90d UPTIME 95.7%
RESPONSE TIME
07-20 · 701ms avg07-20 · 701ms avg07-21 · 2288ms avg07-21 · 2288ms avg07-22 · 1550ms avg07-22 · 1550ms avg07-23 · 2847ms avg07-23 · 2847ms avg07-24 · 2152ms avg07-24 · 2152ms avg07-25 · 1408ms avg07-25 · 1408ms avg07-26 · 1480ms avg07-26 · 1480ms avg07-27 · 1279ms avg07-27 · 1279ms avg07-28 · 1040ms avg07-28 · 1040ms avg07-29 · 1034ms avg07-29 · 1034ms avg07-30 · 1065ms avg07-30 · 1065ms avg07-31 · 1388ms avg07-31 · 1388ms avg08-01 · 1214ms avg08-01 · 1214ms avg08-02 · 804ms avg08-02 · 804ms avg08-03 · 1218ms avg08-03 · 1218ms avg08-04 · 900ms avg08-04 · 900ms avg08-05 · 1111ms avg08-05 · 1111ms avg08-06 · 705ms avg08-06 · 705ms avg08-07 · 1021ms avg08-07 · 1021ms avg08-08 · 1053ms avg08-08 · 1053ms avg08-09 · 965ms avg08-09 · 965ms avg08-10 · 940ms avg08-10 · 940ms avg08-11 · 760ms avg08-11 · 760ms avg08-12 · 815ms avg08-12 · 815ms avg08-13 · 587ms avg08-13 · 587ms avg07-2008-13
AVG RESP 1207ms
PRICE (captured 402, USD)
07-20 · $0.00508-01 · $0.0208-04 · $0.0508-13 · $0.05$0.0507-2008-13
SUB-SCORES (uptime + x402 compliance)
07-20 compliance: 100% checks07-21 uptime: 85.9% compliance: 100% checks07-22 uptime: 89.3% compliance: 100% checks07-23 uptime: 84.3% compliance: 100% checks07-24 uptime: 83.5% compliance: 100% checks07-25 uptime: 85.9% compliance: 100% checks07-26 uptime: 88.3% compliance: 100% checks07-27 uptime: 89.6% compliance: 100% checks07-28 uptime: 91.0% compliance: 100% checks07-29 uptime: 91.8% compliance: 100% checks07-30 uptime: 92.5% compliance: 100% checks07-31 uptime: 92.6% compliance: 100% checks08-01 uptime: 93.2% compliance: 100% checks08-02 uptime: 92.9% compliance: 100% checks08-03 uptime: 93.0% compliance: 100% checks08-04 uptime: 93.1% compliance: 100% checks08-05 uptime: 93.6% compliance: 100% checks08-06 uptime: 94.0% compliance: 100% checks08-07 uptime: 94.3% compliance: 100% checks08-08 uptime: 94.6% compliance: 100% checks08-09 uptime: 94.9% compliance: 100% checks08-10 uptime: 95.1% compliance: 100% checks08-11 uptime: 95.4% compliance: 100% checks08-12 uptime: 95.5% compliance: 100% checks08-13 uptime: 95.7% compliance: 100% checksuptimecompliance07-2008-13

checklist grew 11->14 on 2026-07-28; a step here is a metric change, not a regression

PILLARS OVER TIME (measured)

Measured site and economics pillars from the assessment history, so the latest value shown elsewhere on this page reads as a point on a trend rather than a permanent state.

VOLUME (on-chain settlement, USD)
06-29 · $0.0706-30 · $0.5807-01 · $0.1007-02 · $0.0107-03 · $0.0107-04 · $0.0107-05 · $0.0007-06 · $0.0307-07 · $0.2107-08 · $0.6007-09 · $0.0207-15 · $0.0007-16 · $0.0107-18 · $0.0207-19 · $0.0007-20 · $0.0107-21 · $0.0107-22 · $0.0107-23 · $0.0007-24 · $0.0107-25 · $0.0107-26 · $0.0407-27 · $0.0107-30 · $0.0008-12 · $108-13 · $0.42peak $106-2908-13

Shared payout address (65 other services). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Where a per-service figure is attributed, the assessment block and the ranking, it is the address total divided pro-quota by the 66 services sharing it: a declared convention, not an individually observed measure.

DISTINCT BUYERS
06-29 · 1 buyer06-30 · 1 buyer07-01 · 1 buyer07-02 · 1 buyer07-03 · 1 buyer07-04 · 1 buyer07-05 · 1 buyer07-06 · 3 buyers07-07 · 3 buyers07-08 · 5 buyers07-09 · 3 buyers07-15 · 3 buyers07-16 · 2 buyers07-18 · 2 buyers07-19 · 1 buyer07-20 · 2 buyers07-21 · 2 buyers07-22 · 1 buyer07-23 · 1 buyer07-24 · 1 buyer07-25 · 1 buyer07-26 · 2 buyers07-27 · 1 buyer07-30 · 1 buyer08-12 · 1 buyer08-13 · 3 buyerspeak 5 buyers06-2908-13

Shared payout address (65 other services). These bars are the full shared address (operator-level), so do not sum them across the services that share it. Per-service buyer and transaction counts are shown whole (integers), not divided; only volume is attributed pro-quota. A declared convention, not an individually observed measure.

COMPLIANCE

14/14 checks pass · grade A

last 402 captured 2026-08-04 · last up 2026-08-13

  • 402 payload captured
  • accepts[] array present
  • payTo address recoverable
  • payTo at accepts[0].payTo (conformant shape)
  • payTo is a valid on-chain address
  • atomic price declared
  • atomic price in a sane range
  • asset (token) address declared
  • network resolves to CAIP-2
  • payment scheme declared
  • served over HTTPS
  • declares the current x402 version (2)
  • EIP-712 domain parameters present on every EVM entry
  • x402 v2 envelope delivered in the payment-required header

SITE PILLARS

  • homepage reachable
  • openapi doc
  • pricing page
  • llms.txt
  • robots.txt
  • terms page
recent checks (18) live · click to expand
TIME STATUS RESP CAUSE
● OK 369ms
● OK 228ms
● OK 254ms
● OK 389ms
● OK 261ms
● OK 263ms
● OK 1149ms
● OK 528ms
● OK 144ms
● OK 628ms
● OK 424ms
● OK 409ms
● OK 523ms
● OK 657ms
● OK 142ms
● OK 1118ms
● OK 460ms
● OK 976ms

EMBED THIS BADGE

Show that SYNTHORA Keyless Web Search is monitored on x402-list. Paste this on your site or README, it links back to this live listing.

SYNTHORA Keyless Web Search listed on x402-list
status
SYNTHORA Keyless Web Search uptime on x402-list
live uptime
// HTML
<a href="https://x402-list.com/services/synthora-keyless-web-search?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/synthora-keyless-web-search.svg" alt="SYNTHORA Keyless Web Search listed on x402-list" height="28">
</a>
// Markdown
[![SYNTHORA Keyless Web Search on x402-list](https://x402-list.com/badge/synthora-keyless-web-search.svg)](https://x402-list.com/services/synthora-keyless-web-search?utm_source=badge&utm_medium=referral&utm_campaign=embed)
// HTML · live uptime variant
<a href="https://x402-list.com/services/synthora-keyless-web-search?utm_source=badge&utm_medium=referral&utm_campaign=embed">
  <img src="https://x402-list.com/badge/synthora-keyless-web-search.svg?data=uptime" alt="SYNTHORA Keyless Web Search uptime on x402-list" height="28">
</a>

RUN THIS SERVICE?

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[ update this listing ]

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