{
 "specVersion": "1.0",
 "host": "hergertsynthora.com",
 "generated_at": "2026-10-16T03:47:02Z",
 "source": "mux_registry.json discoverable=1; x402.json for canonical live contracts",
 "entries": [
  {
   "identifier": "urn:air:pay.hergertsynthora.com:mcp:synthora-x402",
   "displayName": "SYNTHORA x402 MCP Server",
   "type": "application/mcp-server-card+json",
   "url": "https://mcp.hergertsynthora.com/mcp",
   "description": "Remote MCP server exposing the current SYNTHORA x402 catalog and synthora_search.",
   "tags": [
    "mcp",
    "x402",
    "base",
    "m2m"
   ]
  },
  {
   "identifier": "urn:air:pay.hergertsynthora.com:a2a:synthora-mesh",
   "displayName": "SYNTHORA A2A Agent",
   "type": "application/a2a-agent-card+json",
   "url": "https://api.hergertsynthora.com/.well-known/agent-card.json",
   "description": "A2A agent card for the SYNTHORA intelligence mesh.",
   "tags": [
    "a2a",
    "x402",
    "base",
    "usdc",
    "m2m"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:air-quality",
   "displayName": "Air Quality",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/air-quality",
   "description": "SYNTHORA air-quality: live air quality for any city or lat,lon — PM2.5/PM10/ozone/NO2, EU and US AQI, and a WHO-threshold operational verdict (good/moderate/harmful). Source: open-meteo Air Quality (CAMS/ESA Copernicus), free, no key. $0.01 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "air-quality",
    "pm25",
    "aqi",
    "environment",
    "health",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:bitcoin-fees",
   "displayName": "Bitcoin Fees",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/bitcoin-fees",
   "description": "SYNTHORA bitcoin-fees: Bitcoin fee tiers in sat/vB (fastest/half-hour/hour/economy/minimum) plus current block height. Source: mempool.space public API, keyless. Bitcoin only.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "bitcoin",
    "fees",
    "mempool",
    "realtime"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:defi-llama-tvl-ranking",
   "displayName": "Defi Llama Tvl Ranking",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/defi-llama-tvl-ranking",
   "description": "SYNTHORA defi-llama-tvl-ranking: Top DeFi protocols by TVL with rank, chain, category and 1d/7d change, capped list (default 50, max 200 via {\"limit\":N}). Source: api.llama.fi/protocols (DefiLlama), keyless, timestamped.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "defi",
    "tvl",
    "defillama",
    "ranking",
    "realtime"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:defi-yields",
   "displayName": "Defi Yields",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/defi-yields",
   "description": "SYNTHORA defi-yields: stablecoin DeFi yields ranked with a risk outlier detector — APY vs class median (>=3x median = the excess yield IS the risk price). Only pools with TVL >= $10M. Source: DefiLlama, free, no key. $0.01 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "defi",
    "yields",
    "apy",
    "risk",
    "stablecoins",
    "verified",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:dnsdomain",
   "displayName": "Dnsdomain",
   "type": "application/x402-resource+json",
   "url": "https://dnsdomain.hergertsynthora.com/service",
   "description": "Full DNS + WHOIS/RDAP domain report in one call. Resolves A, AAAA, MX, TXT, NS, CNAME, SOA and DNSSEC over DNS-over-HTTPS, plus structured WHOIS via RDAP (registrar, registration/expiration/updated dates, EPP status, nameservers), and returns a 0-100 domain-hygiene score with letter grade (age, days-to-expiry, nameserver redundancy, MX presence, DNSSEC, SPF/DMARC, registrar lock). Deterministic, Ed25519-signed. 0.001 USDC via x402 on Base. SYNTHORA. First 3 calls FREE per wallet — send header 'X",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.001,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": []
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:doaj-article-search",
   "displayName": "Doaj Article Search",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/doaj-article-search",
   "description": "Searches the Directory of Open Access Journals article index, returning titles, authors, DOIs, journal, ISSNs, abstracts and open-access full-text links as JSON. A keyless endpoint for autonomous research agents and agent-to-agent workflows sourcing legally free, peer-reviewed open-access literature. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.005,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": []
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:ecb-forex-fixing-vs-market",
   "displayName": "Ecb Forex Fixing Vs Market",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/ecb-forex-fixing-vs-market",
   "description": "SYNTHORA ecb-forex-fixing-vs-market: Compare the official ECB daily EUR/USD reference fixing with a client-supplied USD-per-EUR quote, timestamp and provenance. Reports deviation in basis points and coverage/freshness gaps. The client quote is not independently verified. No live market quote is supplied or inferred; this commercial path does not redistribute open.er-api rates.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "forex",
    "ecb",
    "eur-usd",
    "fixing"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:ecb-macro",
   "displayName": "Ecb Macro",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/ecb-macro",
   "description": "SYNTHORA ecb-macro: official eurozone macro from the ECB data warehouse — HICP inflation, MRR policy rate, 10Y govt yield, each with previous value, change and direction. For macro/rates agents and prediction markets. Official free source, no key. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "ecb",
    "eurozone",
    "inflation",
    "rates",
    "macro",
    "official",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:exchange-rates-verified",
   "displayName": "Exchange Rates Verified",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/exchange-rates-verified",
   "description": "SYNTHORA exchange-rates-verified: FX rates for 160+ currencies CROSS-VERIFIED between two independent sources (ECB official fixing via frankfurter.app vs market aggregate open.er-api.com) with per-currency deviation in bps and divergence alert >50 bps. The product is the discrepancy: a bad rate breaks a financial agent. Free sources, no key. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "fintech",
    "verificado",
    "multifuente",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:fed-watch",
   "displayName": "Fed Watch",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/fed-watch",
   "description": "SYNTHORA fed-watch: US reference-rate funding pulse — SOFR/EFFR/TGCR/BGCR/OBFR with volumes, percentile dispersion and the SOFR-EFFR spread (the funding-stress signal before it hits the news). Cross-check of 5 independent official NY Fed series. The input for Fed/CPI prediction markets. Free official source, no key. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "fed",
    "sofr",
    "effr",
    "macro",
    "rates",
    "polymarket",
    "verified",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:gas-oracle-multi",
   "displayName": "Gas Oracle Multi",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/gas-oracle-multi",
   "description": "SYNTHORA gas-oracle-multi: gas price across 5 chains (ethereum, base, arbitrum, optimism, polygon), each VERIFIED by two independent public RPCs with divergence report — a single RPC can lie or lag; dual-verified is what you time transactions with. Free public RPCs, no key. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "gas",
    "oracle",
    "multichain",
    "ethereum",
    "base",
    "verified",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:gdelt-tension",
   "displayName": "Gdelt Tension",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/gdelt-tension",
   "description": "SYNTHORA gdelt-tension: geopolitical tension index for any topic/country — news-mention spike vs 7d baseline, average tone shift, escalation flag and the headlines causing it. The early signal for Polymarket geopolitical markets (high variance, high spread). Source: GDELT DOC 2.0 (100+ languages, free, no key), 6h-prefetched cache for reliability.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "geopolitics",
    "gdelt",
    "news",
    "tension",
    "polymarket",
    "osint",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:github-repo-activity",
   "displayName": "Github Repo Activity",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/github-repo-activity",
   "description": "SYNTHORA github-repo-activity: Activity metrics for any public GitHub repo (input owner/repo): stars, forks, open issues, last push, language, archived flag. 10-min in-process cache, stale-on-rate-limit or ok:false. Source: api.github.com, keyless.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "github",
    "repo",
    "activity",
    "dev"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:historical-weather",
   "displayName": "Historical Weather",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/historical-weather",
   "description": "SYNTHORA historical-weather: verified historical weather for any place and date (1940 → ~5 days ago) from the ERA5 reanalysis — tmax/tmin, precipitation, max wind. For climate-market backtesting and claim verification. Source: open-meteo archive, free, no key. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "weather",
    "history",
    "era5",
    "climate",
    "verified",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:npm-downloads-range",
   "displayName": "Npm Downloads Range",
   "type": "application/x402-resource+json",
   "url": "https://npm-downloads-range.hergertsynthora.com/service",
   "description": "Returns a per-day download time series for an npm package over a period from keyless api.npmjs.org — the raw signal for trend and growth-rate detection. Lets autonomous agents compute momentum/decline and feed agent-to-agent dependency-selection scoring. Ranking surface for trajectory. First call FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.001,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": []
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:payto-preflight",
   "displayName": "Payto Preflight",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/payto-preflight",
   "description": "x402 PayTo Pre-Flight: verify a payTo address against the live registry before paying. Detects payTo hijacking, stale endpoints and unknown resources. Deterministic, <200ms, no external network. 0.001 USDC via x402 on Base. SYNTHORA.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "x402",
    "base"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:polymarket-markets",
   "displayName": "Polymarket Markets",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/polymarket-markets",
   "description": "Search prediction markets ACROSS PLATFORMS (Polymarket + Kalshi) in one call: live prices, implied probability, volume, liquidity, end date and market conviction. Server-side search that actually finds the market (bitcoin, fed, election, geopolitics). For trading and forecasting agents tracking event odds. $0.05 USDC x402 Base. Input: {\"input\": \"bitcoin\"} (optional filter). Ed25519-signed.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.05,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "prediction-markets",
    "odds",
    "crypto",
    "x402",
    "signed-verdict",
    "usdc"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:polymarket-trades",
   "displayName": "Polymarket Trades",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/polymarket-trades",
   "description": "Historical Polymarket trade query with filters plus per-wallet aggregation. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "prediction-markets",
    "polymarket",
    "trades",
    "smart-money",
    "wallet-tracking",
    "flow",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:port-watch",
   "displayName": "Port Watch",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/port-watch",
   "description": "SYNTHORA port-watch: daily port activity for any of 2,065 ports (Shanghai, Singapore, Rotterdam, LA, Long Beach presets + any name) — port calls, estimated import/export capacity (dwt), 7d moving average vs 30d baseline deviation and anomaly flag. Port volume leads official macro data by weeks: the input for trade/tariff/recession markets. Source: IMF PortWatch (satellite AIS, free, no key). $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "shipping",
    "ports",
    "portwatch",
    "trade",
    "macro",
    "polymarket",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:registry-watch",
   "displayName": "Registry Watch",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/registry-watch",
   "description": "Registry change history from stored registry_delta records, ordered by database timestamp and ID. Query with since (cursor or ISO8601), slug and limit (1..200). Source timestamps and coverage are included; records may be historical and do not prove current endpoint operation, payments or identity. 0.03 USDC on Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "x402",
    "base",
    "feed"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:space-weather-risk",
   "displayName": "Space Weather Risk",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/space-weather-risk",
   "description": "SYNTHORA space-weather-risk: composite operational space-weather risk verdict fusing 4 NOAA SWPC feeds (Kp/G scale, GOES X-ray flare class, solar wind, proton flux) — for defense, aviation, satellites, power grid, precision GPS. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "science",
    "intel",
    "multifuente",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:stablecoin-supply",
   "displayName": "Stablecoin Supply",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/stablecoin-supply",
   "description": "SYNTHORA stablecoin-supply: circulating USD supply, price and peg deviation in basis points for the top stablecoins (USDT, USDC, DAI...), with a depeg alert flag above 50 bps. Optional symbol filter. Free source: stablecoins.llama.fi (DefiLlama), no API key, timestamped.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "defi",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:top-crypto",
   "displayName": "Top Crypto",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/top-crypto",
   "description": "SYNTHORA top-crypto: Top N cryptocurrencies by market cap (default 10, max 50): rank, price, 24h change, volume and market cap in USD. Source: CoinGecko free API, keyless, timestamped.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.01,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "crypto",
    "market-cap",
    "coingecko",
    "realtime"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:usgs-earthquakes",
   "displayName": "Usgs Earthquakes",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/usgs-earthquakes",
   "description": "SYNTHORA usgs-earthquakes: latest earthquakes (M>=4.5 default, tunable) with PAGER alert level, tsunami flag and ACTIVE SEISMIC CLUSTER detection (>=3 events same zone in 24h) — the actionable signal for insurance-risk and disaster prediction markets. Source: USGS FDSN (official US, real-time, no key). $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "science",
    "verificado",
    "multifuente",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:volume-anomaly",
   "displayName": "Volume Anomaly",
   "type": "application/x402-resource+json",
   "url": "https://api.hergertsynthora.com/v1/volume-anomaly",
   "description": "SYNTHORA volume-anomaly: crypto volume-anomaly alerts for arbitrage bots — assets whose 24h turnover (volume/mcap) is anomalously high vs their cohort (z-score), early pump/unusual-activity signal. Composite of CoinGecko markets + DeFiLlama DEX volume. Keyless. $0.03 USDC x402 Base.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.03,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": [
    "crypto",
    "intel",
    "multifuente",
    "x402",
    "synthora"
   ]
  },
  {
   "identifier": "urn:air:catalog.hergertsynthora.com:intelligence:who-gho-indicator-timeseries",
   "displayName": "Who Gho Indicator Timeseries",
   "type": "application/x402-resource+json",
   "url": "https://who-gho-indicator-timeseries.hergertsynthora.com/service",
   "description": "Returns WHO Global Health Observatory OData time series (ghoapi.azureedge.net/api) for an indicator such as life expectancy (WHOSIS_000001): country, year, sex dimension and numeric value. Autonomous agents and agent-to-agent (A2A) global-health analytics, ESG and country-benchmarking pipelines query it for authoritative WHO statistics. Ranking surface: indicator + country to yearly values. First 3 calls FREE per wallet — send header X-WALLET: 0x<addr>. No charge on upstream failure.",
   "payment": {
    "protocol": "x402",
    "network": "eip155:8453",
    "asset": "USDC",
    "price_usd": 0.001,
    "payTo": "0x6D9F318463168fF637b50E5b9a21392e97c7c167"
   },
   "tags": []
  }
 ]
}